They seize, the springs rust and snap and they leak oil, even of they have koni's in them.
did you just put them streight on? or did you put some stuff on to stop them coroding?
only time ive heard of them seizeing and rusting is when people have put them streight on. heard a few things about them leaking, but nothing to put me off,
Threads were greased regularly, But you shouldn't have to coat springs if they are painted. Paint was flaking of after around a year and the car wasn't doing lots of mileage.
Buy cheap, pay twice. If you haven't tried any others you wouldnt know what to compare to. You may as well get Racelands, TBH they looked fairly decent quality in comparison to fk's when i fitted them for a mate.