I've just bought one from a Philippine eBay seller. Looked nice from the outside, but it rattled a bit. On removing the back, the rotor bearing was completely shot, and the balance was very sluggish - swinging less than 180 degrees. The regulator was seized, too. With a thorough service and a rotor plate from a scrap movement, it's OK now. Thing is, it was sold as having been serviced.
From now on, I'll stick to buying from the forums.