It worked for a few months and gave up.  Even when it was working, the cycles of on/off were not correct for every watch and I had to experiment to find the one that would be wound adequately.  For other watches, it might over-wind, but you have no control over that.  Plus, the entire device is light weight plastic.  I have learned the hard way that good quality watch winders are expensive ... and even if you spend a lot, you're not guaranteed to find a reliable one.  Keep looking at online reviews.  I've ordered a different brand, but I don't yet know whether I've found a good one.  I'll let you know if I do.