I'm with Otis. Music is essential, or at least some sensory stimulation is essential, and music is what I have. Also I'd recommend a fan pointed at the rider. I've gotten pretty comfortable on them and can ride no handed pretty easily. The key is to keep pedaling. Slow down too much and you're toast.

I agree I'd much rather ride outside, but when outside is black and icy, the rollers don't seem too bad.