I had a echo stem, it failed. :)
I got it from bike dock and after about 2weeks id managed to bend it to the left at a besarre (sp) angle. Sent it back and got a new one a week later, this one seems fine, and i know a few riders with them so maybe mine was faulty.
They are nice stems though, look the bussiness, just wish you could get carbon fibre ones! lol! B)