A few people here have used them over the years, but did comment that it put some wear on the gears. Typically they would either just wear a Time Bomb, or if one was just used occasionally, they would set up to wind a day prior.
If you have an original, you also may want to look into replacing the capacitor, since the OEM one tends to not hold a charge after a few years (which will be all of them at this point)
http://www.o-review.com/forum_detail.php?ID=10694