I had a set of RollTrac rollers in the 1970s. Great design: continuous sheet steel platform with narrow slots punched into the platform to expose the roller cylinders. Very confidence-inspiring, since you could put your foot down anywhere on the platform.
I got rid of them when the first Racer-Mate stationary trainer system came out. The Colorado Springs Olympic Training Center got rid of their rollers at about the same time, as I recall.
It's true that the rollers were fun to ride, but they would be pointless for me, since I prefer concentrating solely on the workout when I'm doing indoor training.