Feature:
Hmm, 2 knobs per channel. I guess that makes for features. The low contour makes for a nice subwoofer control if you are running passive crossovers, or your crossover is out of reach.
Quality:
Make well, I have seen tons of them still kickin' in other guys racks, mine goes with me on road trips and the like, so I guess it held up well
Value:
Great box, I hear too many guys badmouth things like this, but I figure it is because they don't understand it!
Sound:
Excellent tool to add clarity to your sound. Sometimes, you just can't EQ to fix a problem. This works. No one will come up to you and say, "Hey, I can tell you are using a Sonic Maximizer," but they can tell there is something different.