I've used his for about two weeks and so far it has been great. It's extremely quiet - it sits next to my bed and I can't hear it at all. It keeps my automatic watch wound perfectly even if I don't wear it for several days. My only comment is that since it works on a one hour on, three hours off schedule, if you switch it to stop and remove the watch, when you put it back in it simply picks up on the schedule where it left off. So if you remove the watch in the middle of the rest schedule, put the watch back in later and turn it on, it won't move right away because it's still in the middle of the rest period - to remedy this, simply unplug the power cord from the unit and plug it back in and turn the switch on and it will begin right away with the movement schedule.

Update: January 2013. I've used this continually for almost two years now and it's still going strong.