I just received the grip. The construction is very well. However, I don't know if it is a original FAB Defense grip. It says "FAB Defense" on top and on the side of it.
I will post some pics later this week. Anyway, it feels well and works very well. With a single press on the button, the legs come out and the grip flips open. I can adjust the individual legs and push them inside again.
It did cost me € 41,- incl. shipping, but a additional € 20,- was added due to the costs of the customs.
Anyway, € 61,- is still a great price for a grip like this. I will mount it under my weapon and shoot with it tonight.