I'd be lying if I said I hadn't picked up some sweet vintage threads over at Buffalo, but I'd also be lying if I said I didn't feel slightly guilty about it afterwards.
It's like fishing in a stocked pond: Buffalo gives you the feel of a thrift store but only buy and resell stuff that they deem to be "cool" (saleable). The problem is, they charge two or three times thrift prices, and in many cases the stuff on the racks isn't "cool" at all.
Staff isn't always the most friendly, but I suppose that's bound to happen everywhere.
My advice: try genuine thrift shops and Saver's first, and, if you still haven't found the old school gear you're shopping for, swing by Buffalo as a last resort.