I too have the SRT6.

No problems with anything you mentioned. I blew a 911 Cabriolet away by a car length. Not slow at all, can pretty much take any car on the road. The interior is very nice IMO with the exception of the center console, but it is still better than than the 03 - 04 G35s. The materials used in the dash, seats, and door pannels are of very high quality. You're bitchin' about one-up windows and cup holders? Dude, this is a sports car (at least the SRT6 is)!! Look at the Lotus cars, they barely have an interior!