WOW! that's great that you are able to do the Spinervals DVD's on your rollers! Are you able to get the same intensity and do the one leg intervals? A group of us has been doing Spinervals for a few years, and the people that generally ride rollers tend to ride their trainers while doing the DVD'S. They are very good riders,(both men & women) but don't feel as though they can put in the same effort, stand or do the one leg intervals as well on the rollers. I agree, with you that the rollers have many benefits, and definitely help once you are back out on the road. But certainly a bit more adjustment when doing the DVD'S.