I like Docker's trousers, and I find buying them on eBay much easier than trying to find a store in the UK with them in, Dockers shorts as well.
I also bought some vitamin supplements there, and sold a car and some other stuff.
I think it is a good place to buy if you are careful and I think it's also good that they have different grades of seller, so that you can see if they are trustworthy for $50 $150, $500 or $5000, by looking at their sale history and feedback.