I only rode them one winter; after my head injury. It was suggested that I go to my former coworker's house and ride his until I could do an hour, then it would be OK for me to hit the road again. (My coworker's brother took on the task of being my guardian. Oversaw my first ride, the rollers, he or his brother got me a job at a bike shop and more. My quiet angel. Never said a work to me that he was doing all this. 30 years later I thanked him. His reply "That's just what friends do'")

I barely remember riding the rollers. I had no way of doing a before and after to judge improvement. But they certainly helped, probably a lot.