Well considering even the market leaders SPC (who have now discontinued their EK arms) have had a reported failure on here, who knows really. They seem to be a weak component in general so need to be bought with care.
I have the SPCs and they seem like a really well made, sturdy unit especially compared to some of the flimsy pressed metal ones I have seen, so if you can get hold of a set, they're probably still the ones to get. Failing that I don't know what's next best, Hardrace are supposed to be pretty good aren't they?
What we need is for someone to reverse engineer the SPC arms and start producing them again using the SPC ball joints.