Ive used GMG for a few purchases. No issues.
I've also used GMG for other purchases. I'm not interested in WS, but GMG is a very good dealer and is pretty much the safest 3rd party operation around. As soon as you purchase the item, you usually get it instantly, or within a few minutes. Highly recommended!
In Game Name: Zanaro
Server: Stormtalon (PVE)