i read a article on this. it says really "buyer beware". these mining cards were running 24/7 nonstop for weeks on end. as with any electrical hardware, that places strain on the components. whereas you and i may play a game for 4-5 hours or use the compuiter and turn it off, giving the components a "rest", these gpu were not. constantly going at 100% for weeks severely degrades components.
like driving a brand new car at top speed 100% for weeks with no stop and then selling the car with a million miles on it. would you buy it?
it boils down to if you want to chance it, go ahead.