I used an OM system to cover sports events and airshows from the mid 70's for 20 years. I used winders - rather than motor drives - because they were cheap, light and simple to use. Unlike the camera bodies, which I found extremely robust, the winders would break down after 2-300 films. I just used to bin them and buy new, which you can no longer do. I used to keep a spare in my bag. If you are looking for reliability in a second hand piece of kit then I wouldn't recommend the Winder.