i bought one of those cheap fold up steps (got mine from ebay) i used it for getting off balconies as the rail is always just that little bit too high!
anyway the cheap one i bought i was up on a balcony and just adjusted my weight on the step and the thing just exploded under me with bits of plastic going everywhere and slicing my leg open
i now have one i bought from the local snap-on tool dealer and it is well up to the job, cost a bit more but is well worth it