The worst thing about trainers is that it's really not so great getting out of the saddle, so you're sort of compelled to stay seated for long periods of time. That's very uncomfortable for me. On the actual road I'm in and out of the saddle constantly. Trainers really do feel like crap when you get out of the saddle and stand on the pedals.

Does standing on the pedals feel more comfortable or natural on e-motion rollers? Regardless, I'll only ride a trainer a few times annually or to warm up at a race. The only thing that really keeps me off the road is monsoon rain, a big snowstorm or highly unusual frigid conditions. I manage to ride all winter without much problem.