Great System!
Only had it installed for a couple weeks so far, but I'm loving it. It is so much of an improvement over the stock system. Install was relatively simple, did the speakers one day and the sub and amp the next. Would have had it done in a few hours if it weren't for the fact that I tried to put the sub enclosure and trim back together in the wrong order and just couldn't get it to fit back together :-).
The only possible negative thing I would say, which is more a personal preference is I like to set the sound up to be encompassing between the front and back. Like the stock stereo, you need to push the fader quite a bit to the rear to get what to me is a balanced sound from the front and rear speakers while sitting in the front seat. I'm sure it sounds way louder in the back, but most the time, there isn't anyone in the back!
Overall, very happy with my purchase. I'm finding that I'm coming up with reasons to take a ride just to listen to my music.