Which is the best place to buy a used X-Box, EB or Funcoland?

I’m interested in buying an X-Box, and since I can’t afford a new one I’m going to used approach. I’ve checked both the websites for EB and Funcoland, but not the real stores yet.
The prices looked pretty good, but does anybody know if these used systems are tested before being resold? Has anybody had problems dealing with either of these 2 stores buying used consoles?