I was a bit concerned at first cuz I had it going for about 3 hours and some automatic watches I had that had not been wound were still not running, but after a bit longer they began moving again. I think the angle or the movement of the winder is not quite right as I do think the watches should have been running after a short time. these guys usually start ticking after just putting them on my wirst and setting the time, so I was surprised they took so long to show any movement. that being said, they have been running for a few days in there and seem to be doing okay. I think this works fine for watches you want to keep running and are wearing often. If you are not wearing them every few days, you may lose time.
Also note, the winder has a great mechanism to stop the winding movement from functioning when the lid is open, so if you are wondering why yours is not moving, that is why. This is not mentioned in the manual and at first I was confused about how to turn it on, but once I figured that out, I am glad it is there as it makes it easier to take the watches in and out. It is very quiet, looks nice, and seems okay for the price.
I would say is less of a winder and more of a reserve preserver.