About a month after I started using a winder one of my Rolex's spring sprung. The jeweler couldn't say it was related, but he could not say it wasn't. Like surlynkid said, I was using it so I didn't have to set the time/date on each of my watches when I wear them. Now I just use the winder as a case with it off and set the time on the one I wear that day like I always did before.
'14 528-xdrive - daily driver/winter beater, '06 Boxster - for fun, '07 M6- for even more fun.