Just picked this up today. Aesthetically it's the cleanest Regal I've ever seen. Though there are a couple small mechanical issues.
The A/C doesn't work []
The crank pulley wobbles a little, could just need a new one.
There's a occasional coolant smell coming from somewhere.
It needs a tune, bad, lol. The IPWs on the 42# injectors are over 20 and it's definitely not moving the type of air that would require that much fuel... easy fix.
Other than that, it handles great, rides great, sounds great, looks great. I'm totally happy about it... way nicer than my Regal ever was. I just hope nothing stupid happens with it because I'd really like to enjoy it for awhile.
Mods on it are; XP cam, GenV, N*/LQ4, coilovers, intake, catback, SLP headers, etc... It moves out pretty good.