Heavy duty jack stands - 5 or 6 ton I think, 5 years used all the time.
Engine stand, used occassionally - so far no problems, had about 3 years.
Vise, 10 years busted it - but stil useing it.
Needle gun - used maybe 10 times, some heavy use, no problems.
Various pullers, 1 year no problems - used in rebuilding my trans.
For some things, I think their pretty good. As has been said some of it is of no quality at all.