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I have GB. When I took them to a shop to get them fitted (mistake, btw) the mechanic didn't seem to know what to do and asked another mechanic who said that they were "copies of the VO ones".
The main complaint seems to be that they don't come with the requisite hardware for fitting, and if the shop don't have the right bits they are liable to bodge.
I've since removed them and re-fitted myself, and they are rock solid now.
TL, DR: make sure you get the bits you need to fit them.
Anyone tried Velo Orange stainless guards? Worth the extra over Gilles Berthoud?