Well, I just helped out a friend who had some equipment installed by Kaoss. He bought a Kicker 1500 and 2 12" L7s with box and had Kaoss install them. Apparently one of the terminal cups on the box was bad (how do yu **** up a terminal cup??) and so the guy apparently jb-welded the terminal post in (sideways, for that matter). What he didn't realize is that he isolated the driver from the amp, causing the other sub to run at 2x rms and make some really horrible noises. Then he blamed it on the subs being bought on the internet. wtf. I fixed it and sent him on his way, but for $250 I would hope they wouldn't overlook crap like that.
Two big thumbs down in my book. But I despise car audio shops anyway. Greedy bastards.
Edit: Oh, and I forgot that they wired his 1500.1 with 4ga. And charged him $80 in wire.
The box was gonna be $250, but I'm gonna take care of that.