This handle is absolutely identical to the Canon-handle, with subtle differences to the surface, suggesting that here the injection molds were simply copies of the original part. No difference at all from the outside can be seen. The inserts are interchangeable with Canon, I have not tested with the inserted cells crosswise. Only the texture of the rubber is different from the original. The pressure points of the keys (particularly the trigger) are better than Canon.
I have since photographed an event with the Billigheimer without problems. Since I get a refund for the original handle, I will first go on like this. Who wants to save a quick hundred on accessories at a not too expensive camera like the 600D is probably in this handle to the right place.
When I think, I like to update the review in a few months again.
PS: In the meantime, I'm 2 years with the grip on the road; there is still nothing to complain about. Also not on the rubber. ;-)