I've ridden race bikes (3 wheelers) with the twist throttle and I hated it. Almost killed myself riding a whooped out trail and lost control of it after hitting some major bumpage. Never again!
Snowmachines have the same throttle as atv's and the big thing these days is to turn them around so your squeezing the throttle with your fingers instead of thumb. Haven't tried it yet but might next week.
