Is it worth buying second-hand gear for mining?

I'm doing a quick poll for a buddy of mine. So, is it a good idea to invest in used mining hardware? They’re looking to use this info for a big study on computer hardware over at MediaPeanut (my friend’s gonna publish there).

Glad to reply to you! High-quality second-hand equipment is very cost-effective, but buying second-hand equipment requires professional vision, and it is best to test the equipment on the spot.