I've never owned one, all of mine came with my Canon lenses, but several people have reported in various forums that they have and have been very pleased with them.
I bought a remote for my D300 from a company in Hong Kong. I was reluctant, but it came within a week and has worked like a charm. The parcel was tattered, but I chose to chalk it up to UPS. Every parcel I get from them is that way..... I don't like them.
Anyway, I figure that any money spent on purchases from eBay will not exceed what I can piss away for a bar bill on a good night.......