Ahh, rollers, it's so much easier and safer to ride on a modern stationary system. Rollers are for fuddy-duddies and new, young modern cyclists that don't want to get to be better riders. One can go brain-dead on a stationary system, not so on rollers. Wow, you actually have to concentrate; imagine that?
Quite frankly I was never all that good on rollers. I think the longest I could was bout 10 minutes and I started to wobble...a lot. Get on the road ofter a session on rollers though and what the other post said is true. You will run a straighter line with less effort and concentration. It just happens out on the road.
That was back when I used to balance-train for my skiing on a Bongo Board......