I recently took delivery of a Speedmaster Professional (Hesalite) from Darek (@demollo). This was the first time buying a watch via a forum member for me, so you can imagine the amount of hesitation I had. Fortunately, Darek was nothing but helpful and professional as a seller, and very forthcoming with any questions I had for him.
A few items of note:
- Packaging was extremely good, as other members have described. "bomb-proof" is an exaggeration, but the package definitely had a LARGE margin of safety if you were to run it through FedEx/UPS standard packaging qualification test procedure (which covers drops, compression, vibration, etc).
- Customs help when the package got held by CBP during import. All of the paperwork/documentation was provided to me, so I only had to correspond with FedEx once and got the package quickly cleared through customs.

I'd happily make another purchase from him again in the future!