Have purchased vintage items from these folks before, excellent selection, everything well described and documented. Also an amazing Wiki on their site for sorting out all those tiny plastic guns and whatnot you may have lying around and don't know what they go with!
Sold these folks my collection of vintage items from when I was a kid. They do negotiate a hard bargain, but ultimately they were very fair with the price. They were also easy and fast to communicate with, payment was quite prompt and they trusted me with 80% up front when I shipped the goods. That's a demonstration of good reliable business!
All in all an excellent experience and would recommend them highly!