You can only try them.
I've only changed the screen of my girlfriend i**** and got 1 from ebay.
the seller delivered the first screen, which was faulty, but then he replaced by a good one.
normally they should be ok if you buy from a powerseller.
Device: HTC Sensation Z710e (S-OFF w/Juopunutbear - Rooted)
Previous devices: Galaxy tab P1000, HTC HD with my ROM Blackstone EDGE
, PocketLook T830