Just my two cents ... Other than convenience, I have never been convinced that they offer any real benefit and that they may actually shorten rather than lengthen the life of your watch. A watch is not meant to run continuously, other than normal daily wear on your wrist. I know there is a lot of discussion about protecting against oil coagulating. However, in 25 years dealing with automatics without a winder this has never been an issue. As long as you keep your watch in a stable place the oil should remain evenly distributed as it was when your watch stops. That being said you should still make an effort to wind your watch every month so.
Once again this is just my experience and YMMV.
Once again this is just my experience and YMMV.