In reply to Kai:
Here's another report of an abseiling failure:
http://www.geoquest-verlag.de/?q=node/455
Edelrid customer service response excerpt from the post: (Google translated from the German.)
"From the first batches of a total of 8 units have us actually sent back where the wire was torn out.
In half of the cases we have to assume was that tries after Geoquest articles forcibly pull out the wire.
During rest was actually the compression of the wire obviously not sufficiently strong.
since the units are assembled here in Isny, we were able to respond immediately and have the compression revised. Currently, the wires have an average separation value of 4.5 kN. When used correctly in accordance with instructions for use appear on the wire forces of up to 0.2 kN.
since it is the wire not a safety-related component and reliable brakes the machine easily without a wire and can be used for rappelling, we see where there is no danger.
Thank you, Sebastian Straub"
Here's a lowering failure:
http://www.mountainproject.com/v/edelrid-mega-jul/108052298__4
Per the Edelrid customer service rep, the wire is supposed to have a separation resistance of 4.5 kN. No way that my thumb can exert anything close to 4.5 kN of pressure on the release loop.