Man, I tried using them earlier this week, and I lost like everything! I used to be able to ride rollers one-hand, crossed-hand, one-leg, and even could go over a minute straight looking backwards over my shoulder.
I was like a green rookie on the rollers - leaning on the wall for dear life. Made me realize how dodgy my bike balance and handling for small motions has gotten.
Fortunately, I seem to be relearning it with small sessions every day - I can now just use the wall once per minute or so, but I'm still at least a week or two away from doing the over-the-shoulder look.
Just sayin' - don't throw out or forget about those rollers - they're good stuff!
(I'm taking the super basic TravelTrac rollers, not the ones with fore/aft float and side bumpers that let you stay on a lot more easily.)