I've got some. They are 'alright'. I think I've fallen on one, so it must be rated ok. However, they are the first to get left behind when I don't think I'll need my full compliment on a route. (A bit heavy compared to the rest).
Fcuk it - I payed £9 each for 10 of them when i started climbing. The crabs are excellent - not as smooth as your 13 quid a go mambas or wotever, but smooth enough - the bent gate is very easy to clip, think its cos its got a quite extreme bend in the gate.