'Bent was funny. The race went from 11 a.m. to 7 p.m. Toward the end, he got a confused look on his face, "I'm really hungry." It wasn't a feeling he'd had very often while racing! I've often said that his stomach would probably feel fine if he were forced to race at my pace. I can almost always eat. (Unfortunately.)
Aero doesn't really matter on mountain bikes. The upright bikes are getting much more upright too. It's all about being in the position that is most comfortable and gives the best handling. Save the aero for your road recumbent.... And get a full fairing ;)
They need to allow these on the Time Trial at the TdF. Their TT bikes are already pretty weird. Let the big boys ride these, and things will really evolve.
If I was a roadie I'd have one of these, or maybe this