Thanks for the replies so far. After that hour on the rollers yesterday I found that my glutes were a little sore. One thing I have found with rollers is that they give your backside a better workout. It's used more for balance, and pedaling in circles puts more muscles to work. This morning I did a fast, 70km ride at the park, and could already feel the improvement in my balance. There are a couple of small climbs which turn as they level off on top, and I took these turns like I was on rails.

Tomorrow is Wednesday, the day I usually try to put in a long ride. But the forecast is promising rain. If so, I'll get another chance to ride the rollers.