I have been and Ebay buyer/seller for 20+ years. I understand everyone's comments here, however, I am in northern California. This this is where there is no York, or the numerous train shops and mail order houses that are on the east coast. Therefore, going somewhere to actually put my hands on it is slim to none.
I have bought on Ebay, and never had any may issues to speak of. I have also purchased items from forum members with no regrets. Quit frankly, Ebay gave me access to items I would have never had, and made wonderful relationships with those sellers. They even knew which items I was looking for. However, I normally purchase the locos from a dealer.
Joe Gozzo