[brianmontgomery2000]

Because TGM is based on a solid bio-mechanical foundation, almost all swings can be described and worked with, imho.

ICT

Yep, system versus method. I think that is both its obvious strength but also its ultimate downfall -- it takes a lot of work and study to understand the system and then you still have to put your pattern(s) together and then you have to be able to execute it. I think most methods do the first two parts for you.

Downside to methods are, however, you better hope the pattern they teach fits you!

So, TGM is ultimately for those willing to work on multiple fronts...