Rollers are great for helping to smooth out and speed up your pedal stroke. I've found them to really help in cleaning up my form this winter. They're also great for improving your balance and handling skills. Once you get used to them, they make anything on the road seem like cake. I road to work this morning in the wet snow (1-2") and I know my time on the rollers helped. I was much more in tune with my bike and could catch my rear wheel whenever it began to slide and easily correct for it without over compensating.