Excellent service, purchased a secondhand 12-100 Olympus lens from 42nd Street Photo, arrived well packaged and exactly as described, this is the third lens that I've bought from them and it's the only I would buy second hand gear from un-inspected, I know if an item is not exactly as I want I can return it and their service is always very prompt and polite.
Can't recommend too highly.
Tip for consumers: an accessory was not shipped with lens