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I purchased this Casio ClassPad 330 through Amazon and Computer Brain Inc. I ordered the calculator on November 15 and I received it on November 18 via an express carrier. I am delighted by the responsiveness of Computer Brain and their working relationship with Amazon. It's an ideal partnership that gives buyers like me a great feeling of security, and attention at a great price.
I bought the Casio 330 AFTER I already purchased the Hewlett-Packard 50G AND the Texas Instruments nSpire with TI-84 keyboard. The HP is a quality product built to the standards of their long line of calculators. The TI nSpire represents great value for the price along with a widespread user community. I kept the HP because of its external SD storage capability although it will take me a long time to master the keyboard and internal functions. I'd rather not spend the time required with the HP to master its capability. I was a former jet aircraft pilot and I like to joke that the HP is more complex than my old aircraft cockpits. Regrettably, I returned the TI nSpire/84 because the display was so dim that my eyes hurt after ten minutes of straining. When calculators like the TI have adjustments for contrast, it's really an erroneous understanding because when you increase font contrast, you also increase the contrast of the background screen which means the font does NOT improve relative to its screen background.
The Casio 330 has tremendous contrast range which actually works. I even left the contrast setting at the default level because it is super, even for my old, tired eyes. The screen has stylus touch ability that HP and TI both lack. This makes the Casio operate a lot like a Personal Digital Assistant (PDA). It's intuitive, responsive, and fun to work with. There are applications, functions, and modes of operation common to other high-end devices along with the ability to connect to a desktop. If you feel that Casio is limited to low-end, low-cost devices, think twice and give this calculator a chance. If you purchase it from Computer Brain through Amazon, you'll discover like I did that it's the perfect solution to other troublesome calculators. One last thing-the Casio comes with a hard-shell protective case, startup manuals, cable connectors, batteries, and the best news of all - IT'S NOT PACKED IN A BUBBLE-PACK which is often impossible to open. Casio comes in a nice, "retro" box.

I've used the ClassPad 330 while taking college math classes and now as a math teacher, and I'd recommend it almost without reservation to both students and teachers who are learning and teaching math. Whether it's an algebraic equation or a limit, derivative, or integral, it can solve almost any standard problem you'd see in high school math or the first year or two of a college math major sequence. (Not talking about word problems or proofs of course.) It can solve these problems symbolically or numerically and in 'math textbook form' for both input and output. The lack of standard input keys is no issue because the stylus-based touch-screen contains hundreds of math operations in logically-organized menu sections. This calculator also has powerful statistics, series/sequences, programming, standard-graphing, and 3d-graphing tools. It has a useful 'split-screen' feature where you can, for example, view your definite integral solution on the top half and the graph of that integrals area on the bottom half. Speaking of the screen, the display is clear and easy for my eyes to focus on even after spending hours solving problems in low-light conditions. While the ClassPad 330 may not be 'legal' on every math test you take, it's proven indispensable to me in studying and preparing for tests (and now creating and double-checking tests of my own). As a separate product, you can buy an emulator version (ClassPad Manager) that is very useful for teachers, as well as create activities and demonstrations for students with just the ClassPad 330 itself. One caveat though--this is for students of math and science (as well as teachers, engineers, and scientists in the working world) who want to delve deeper and perform, mathematically speaking, at their peak. If you're taking a college algebra class for a liberal arts major, have no interest in math (which is completely fine of course, English was my first major and I love the liberal arts), and will never take another math class again, this calculator may not be for you.

I'm Venezuelan and i'm studying oil engineering... This graphing calculator is a great and very interactive tool... Easy to use... I first had the HP50g but i changed it for the classpad because it saves me much more time in the exams than the other, the only thing i don't like about the Classpad is the lack of an unit converter as the one of the HP, its kind of important in what i'm studying and now i don't have it.

Excellent product, better benefits at a low price. Recommended to all engineering students and professionals.

pros:
1-stylus pen operation is very nice.
2-excellent screen contast much better than the Ti nspire.
hint(if you purchase this calc. take the transparent protective sheet out from the lcd screen, this will boost the contrast a lot.)
3-very fast 3D ploting and easier to rotate with the pen.
4-super near perfect electronic manual.
5-built in Laplace and fourier transforms and FFT.
6-ease of use.

cons:
1-we couldn't figure out if it is allowed in SAT, may be not.

advice:
the casio FX9860 II plus (not yet on amazon) is allowed in SAT.
it does nearly every thing like the TI 89/84 and it costs half.
it has a back light screen, and does every thing a high school student needs to do.
plz have a look on youtube for a demo. it is nice.