I previously asked whether other users had experience of or information about GM carabiners. This thread is here:
http://www.ukclimbing.com/forums/t.php?n=618670
I just wanted to post an update for anyone considering these carabiners.
Since then it seems GM has obtained UIAA certificates for its carabiners, which can be viewed on the UIAA website (if you search for GM under "Brand Name"):
http://www.theuiaa.org/certified-equipment.html
Of course, I am only deducing this from info on the website.
CW