IMO they are ok. My friend has their crystal cmp8 DS and those 8's hit hard. He even got it metered and he hit in the 130's.Even if the mike is off a bit by 3db these were 8's.Plus their boxes arent made forr spl. their total sq boxes but the spl is a plus. And i like the fact that they have increases in spl evrywhere,unlike some ported boxes that peak around certain frequencies it stays almost constant in spl output most of the time.
but yea Nite scort is right about their prices. Even though their some really good boxes, i dont believe paying aorund 350 for a 12 box. But I plan on getting 1... but lucky me theirs a local car audio place near me tht sells them so i dont have to pay shipping.
if you havent heard a sanil shell you just dont know they are amazing by puttin your sub in a snail shell you are guarnteed a 7db increase and the snail shell makes your sub have better sq its worth it