I have used them in the past on some cars I have owned. I went with the polyglass series ps165v1 and some pc165's in the rear. Jl Audio 900/5 amp and a 10 inch Jl Audio w6 subwoofer. I decided to use an old school Audio Control EQS instead of a DSP to tune the stereo which I think will come out...
Went out in a friend's demon 170. Not many things impress me these days, but that thing is awesome for a stock car.
Dropped my car off at the stereo shop for a complete install of some Focal / Jl audio goodness. Hopefully this comes out like I want.