I signed up for TGM in preparation for our upcoming trip. I have been reading over his stuff for 6 weeks or so now. Here are my impressions...
1) The dude know his stuff. I like that he operates more on a philosophy of touring than on "Xs and Os". That clicks well with my personality and learning method.
2) The site can be a bit hard to navigate, but give yourself a couple hours and you'll feel like a pro.
3) If you want the cutting, bleeding edge of current info, TGM aint the place to get it. That just doesn't seem to be his priority. Now this is OK by me, but for others not so much.
Bottom line: I am glad I signed up for TGM, respect what he is doing, and think he will help me on my next trip. But it is not for everyone.