Initially when I tried to get tickets for Newark there were no GA available. I logged in again from my phone about 20 minutes later and got to GA with no problem.
My Experience with TM Verified is this pre-sale and Bruce Springsteen on Broadway. In both cases it seems that tickets stick around longer. While you are never going to eliminate scalpers, I think this system is at least better.
I know it is not popular to say, but since I have been a member of the Fan club, I have gotten GA tickets with little to no problem for every tour.