I don't buy used stands that I'm going to use for cymbals with my kits anymore. The price difference doesn't justify it.
I have bought some used junker stands that I modified for different purposes that turned out well. But some of them are just plain junk - chipping/rusted chrome, stripped out threads (can't tell that from photos), dented shafts from over-tightening, shafts that won't slide or that won't tighten down, missing feet, and various other problems