I use the wrist strap that came with the GR which seems roughly the same size as the one in your link. I don't find it effects the pocketability of the camera and it is small and unassuming when it is on my wrist and it gives a sense of security that I won't drop the camera.
It is however very awkward when you meet someone and they want to shake yor hand. It happened at least five times last night. With strap attached to my right wrist I held the camera with my left hand and shook with my right. Very Sauve.... Lol