Felt the same way, I'm 6'3" and (at the time-250lbs), and wanted to know if I could fit in one. As others have stated, play with the seat adjustment and you'll most likely find a comfortable compromise. We've driven to both CAA's in ours, and I've had no back issues on arrival. Can't say that about some other cars we've owned.
PS-3 years and 25 pounds lighter(all that detailing and polishing, don't ya know), still love my Coupe.