Ive liked the sets ive heard but i wouldnt spend the $ they want for them. Better can be had for cheaper. Ive heard people complain about the tweets being too bright but i didnt notice that in the sets ive heard.
Good speakers. Sort of a love-hate company though......you either love their components, or you hate them. I'd definitely suggest listening to some sets before you purchase any.
I've heard one of their 3-way sets (KP Series I think??) in some kick panels. At lower volumes they sounded amazing, but seemed to get a little harsh/distorted when turned up. In all fairness though, I don't think the guy had them tuned properly.
I like them a bunch, but the tweeters were too bright for me. Look into Dls stuff, great sounding for about the same $$$, and if cash isn't an issue, get Dynaudio.