Just got mine in yesterday. It's pretty robust. Sounds really good. Pumps out power. Has a few features that I thought are cool (not the reason I bought it though):
1. Powers down when it gets hot, but does not turn off. Just lessens the output until it cools back off.
2. Has ground loop switches on the bottom. If you have a car that induces noise you can turn this on to kill alt whine, if not then you can leave it off.
In my situation all I needed was power. I have my processor to do everything else (x-overs in this case). For the money, I feel these are great amps. I think they can be bought for $160 online, though I paid $140 shipped for mine. Also doesn't cause anymore dimming than my previous amp did, but puts out 2.5x the power @ the same impedence. This really brought my Rainbows up to speed, and I have much more clarity and refined sound (especially in the 200-2400hz range). I'll be taking my previous 4-channel and use it bridged on a good set of midranges, but that'll be a few months. For now, a 2-way setup will have to suffice. SQ system, here I come.
To sum it up, GREAT amp for the money.
Installed (False floor FTW):
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Edit: $170+ shipping
HERE.