I just ordered a 1.7 SL BB. Not the XLC because I'm 5'8" and 175 so I didn't think I'd need it. It will be only for the hottest summer months, so I won't need a pad or UQ. I have 2 RRs for that.
1. Is it the XLC?
2. How does the footbox affect the lay? Do your legs twist at all when your on your back and your legs are straight.