Home > Consumer Reviews > Waterloo Sit Or Stand Capable Arm, Keyboard Tray & Mouse Tray Package Featuring Lift-N-Lock Adjustability Black

The build quality of the product is excellent. I bought 2 of these. One for myself and one for my brother. Combined with an adjustable height chair, the ergonomic adjustments that are possible are phenomenal.

Some dimension specs you probably won't find in any literature which might help in the pre-planning stage should you choose to purchase this product.

Length of arm mounting glide track under desk: 22"
Width of arm mounting glide track under desk: 6"
Depth of arm mounting glide track under desk: 5/8"

Width of tray arm: 4"
Depth of tray arm: 8 3/8" Max(in lowest position below desk)
Max height of tray arm: 3 1/2" (in highest position above desk)

Max forward extension of tray arm from end of desk: 5 1/2"

Keyboard surface: 21" wide x 8 1/2" deep. (Keyboards that are deeper than this may fit if they rise over the 4mm back lip.)

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That said, you'll want a desk that is no less than 23" deep (from front to back). And since the unit is sort of heavy, you'll want to mount this on a desk whose top is no less than 1" thick and has a closed back. Otherwise the weight of the unit will cause the center of the table to sag a bit.

Other notes:

1. There is some wobble each time you initially rest your hands on the keyboard tray as the tray settles the spring. None while typing. Lift your hand off and the tray rises 2mm-3mm back to where it was before you rested your hands on it.

2. The mouse tray is 1/2" below the keyboard tray top. And like the keyboard tray, there is initial wobble when you rest you hand on it. It settles almost immediately when you use the mouse but in no way affects mouse use.

3. A nice feature whether intended or not is that if you use a mouse pad, be it round or rectangular, there is enough of a gap between the mouse tray and keyboard tray, that the mouse tray it will slide under the keyboard tray with the mouse pad still on it.

4. Recommend a mouse pad because the surface of the Mouse tray is too coarse for mousing. Keyboard tray dimensions are as follows: max extension is 9" while the depth is 8 1/2".

5. Have no fear of knees hitting the arm under the desk. You can't sit close enough for that to happen. Neither would one have to worry about clothing or skin getting snagged by hardware under the tray. The nuts used to attach the tray to the arm have rounded caps.

Overall:

Very satisfied with the high quality of the unit and with the seller's prompt shipment. Highly recommend it.

I finally have a keyboard tray that I, being as short as I am, can have at the low height that I need, but others can raise it when they want to use my computer. Anyone who tried using my computer before kept banging their knees into my keyboard tray. This new keyboard tray was exactly what In needed.

I also really like how solid it is. We installed a less expensive one for someone else, and it practically bounces with each keystroke, and is difficult to get to stay in any setting other than its lowest position. So I am very happy with how solid this is. Plus it adjusts to any position and stays there when I need it to.

Another nice surprise about this keyboard tray is that it came with a sheet of non-skid rubber matting to place under the keyboard. It is wonderful to keep the keyboard in place. It's too bad they don't include one for the mouse extension.

I have two minor complaints about this keyboard tray. The mouse tray surface is 1/2 inch lower than the keyboard tray surface. I am used to having the mouse at the same level as the keyboard tray, and this seems to make me reach for the mouse more than I had to before. I am thinking of getting some sort of padding to raise the surface of the mouse tray. Or maybe it is just something to get used to.

My other bigger complaint is that there was nothing in the description telling me how big of a flat surface area is needed for mounting the tray. That mounting plate that the tray attaches to is 6 x 22 inches. I was so disappointed and thought I would have to return the tray because my terminal table that I was attaching it to has a support bar that crosses 16 inches from the front of the table. Luckily my husband thought of putting in block spacers to make a surface below the support bar so I could still attach the keyboard tray. However, that means my keyboard tray is not quite as flush with the table as I had envisioned, but that's OK. I was able to raise my terminal table height to make up the difference. So I just want to let any future purchasers know that you need a flat surface area of 6 x 22 for mounting the keyboard tray.

Those are both small complaints that I could work around, so I am still giving a 4 star rating. If it weren't for those, I would give it a 5 star rating, because I really do like the keyboard tray!

I've used the less expensive keyboard trays sold at office stores, and they always seem to break after a couple of years. Or a critical plastic part shatters with one accidental bump. Their ball bearings start to bind or fall out so the tray doesn't roll in/out like it should. They have no height adjustment.

This arm and tray are quite different. The mostly-steel build is high quality and I haven't found any defects. It's clearly made to last, and would shrug off accidental bumps. There are no ball bearings to wear out, and a minimum of plastic used. The keyboard/mouse can be angled for typing comfort, though the mouse could slide off at a steep angle. I recommend adding a mouse pad with wrist rest, if you do a lot of mousing.

My desk/table is very deep, and I recessed the mounting bracket so that my keyboard/mouse disappear under the desktop by nearly 10 inches... great for non-computer work: sit right up to the desk. Yet, the keyboard/mouse can be extended about a foot (total) in front of the desk and angled for comfortable typing while reclining. The arm glides in/out on a greased track with four plastic (Delrin?) bearing points. After a long time of resting my wrists (get the optional palm rest), the tray sticks in position, but a little force frees it to glide in/out again.

The one disadvantage over those cheap keyboard trays is the size of the support arm. It sticks down 6.3 inches even when set for minimim profile (tray neither raised nor lowered). I've learned not to bang my knees on this "immovable object." When I push the tray all the way back, it's not an issue because the arm is well away from my knees.

Per other reviews, the instructions are minimal and you're expected to figure it out on your own (which isn't too hard). The thickness of your table/desk top must be enough to support a lot of force, especially with the arm extended and your wrists leaning on it. One-inch thick particle board seems fine - no sagging yet. The hard foam palm rest attachment is more firm than some squishy gel types, but quite comfortable over long periods of use and seems to wear well.

There is a large handle on the tray height/angle locking screw. It can be repositioned so the handle is out of the way - just pull the handle out, turn to the preferred position, and release. It re-engages at the new position.

I don't expect to need another keyboard tray, as this one should never wear out or break. But if I did buy another, it would be this Waterloo or equivalent.

This keyboard tray came just as described. It is very durable and the option of using it while standing is great. As mentioned by others, the instructions do leave a lot to be desired.

You have to start by installing the bracket to the bottom of your desk first. Then the arm, and the keyboard tray last. It was worth the frustration now that it is installed. It is solid, and doesn't move when typing. Good overall value.

Great keyboard tray. Extremely solid with quality workmanship seldom seen these days. Miles better than the many other trays out there that I've seen and tried out.

A couple things keeping it from being perfect:

1. The slide out mouse tray doesn't lock in place (it's just a nice plastic board that slides underneath to the left or right of the keyboard as necessary) so it can start rattling when typing and move in and out. It would be much preferable to have the mouse tray bolt on to either side, and actually wrap to the front to make it closer to hand. I'm thinking of putting together something myself to do so on both sides.

2. I have such long arms that any tray/desk I use must be as skinny as possible. This tray is over one inch thick (especially due to the the mouse tray receptacle all the way along the bottom). As such, it is extremely solid in construction, but definitely takes up too much room (especially with a large natural keyboard, space is at a premium under and in front of the desk).

3. And last, just a very small issue that warrants mentioning: the boom that makes it so you can sit or stand with it juts down - I've banged my leg on it a couple times. Having said this, I don't see how it could be designed any differently considering the fact that the boom has to go somewhere.

All in all, very pleased with my purchase.