Really not much to write about. Winder A allows you to take photos more quickly since the film advances automatically. It works very well but adds considerable weight to the camera using multiple double A batteries. As I get older I have removed winders and film advancers from my cameras to lighten the load. Having to manually advance the film makes me slow down and compose the shot. I also find that manually advancing the film is very soothing. But the winder works very well and is quite inexpensive to find today if you want to use one.