I've had a set of rollers for about ten years, and while I don't log hundreds of hours on them in the winter time I do generally try to spin a couple of hundred miles on them before heading outside once the snow melts. I also have a mag trainer which is better when higher-output pedaling is desired, but for base aerobic fitness I enjoy the rollers much more. I set them up in the basement next to a lolly column so I've always got something to grab on to should the need arise, and in my experience, that need WILL arise. This past winter I was spinning on them while watching a little TV when I inadvertently drifted too far to the right. Unfortunately, it was at that exact moment that I realized I was also too far forward relative to the column to actually catch it. I went down, but fortunately there was a NordicTrak there to break my fall. Over the ten years I've owned the rollers I've probably taken good falls about five times, mostly during the first year I had them.