As a newer cyclist I used them 1-2 times a week last winter and found rollers helped my bike handling skills greatly. Due to my work schedule I am unable to get much group riding experience. So when I did get in a group I was kind-of nervous and I was that squirrely guy who we all read about.

The best way I can quantify it would be how long I can stay on the 4" White line on the side of the road while looking down the road. Before rollers I would estimate I would stay on that line maybe 30% of the time. Now I stay on the line probably 70% of the time. The way I can tell if I am on the line or not without looking down is due to the multiple coats of paint on the line I feel significantly less road buzz when on the line.

I still suck at group riding because I don't get enough group riding experience but being handlebar to handlebar with another cyclist does not freak me out as much. I am also less nervous about some roads where there is limited shoulder room and cars are zooming past me. As far as helping pedaling efficiency I can't really say. As far as improving my fitness over a trainer or the road, probably not. Over sitting at home and doing nothing' absolutely yes.

Bottom-line as a newer cyclist the rollers helped a lot with my confidence and knowing where my tires are in relation to the side of the road.