Actually, almost every professional forum's GB is based on trust, we believe imsto because he did same things many times already, and others as well, I would not bother myself if there is no such trust. imsto has good reputation as well. I never buy anything from him yet, this is my first time payment for GB from imsto but I sent it when I got PM. If you don't believe any, you will not able to participate GB here. Maybe not all, but at least most interesting GBs here. Good luck.