theDreamer's Z
Have had mine for almost a month now and love it, ran into one issue with a wire/solder not holding, quick fix and like new. I am not running a bunch of add ons (rear view camera, XM, etc.) but GPS is good when I use it, love using my USB drive for music (have not tested iPod setup). My friend runs the Z110 in his Civic Si with aftermarket amp, speakers, subwoofer, etc. and it works fantastically, and I know JB-370z likes his a lot (member on this forum who helped install mine).
The unit will get even better later this month or next when the Z120 comes out, the Z110 & Z120 use the same hardware but different software. The Z110 will be able to purchase the software upgrade if you want to get all the new features.