I did GS for all of March, and loved it!!! It was a new to me workout. I'd compare it most to Meso 2, but it is different than STS. I really, really enjoyed GS, and it started out tough, tough, tough, but it must've worked, bc it got easier at the end. I did match Cathe on her weights, but it was a struggle at the begining to do so. I loved GS, and can't wait to do it again. I noticed some good arm def in GS.
If I were you, I'd go ahead and get it.
Nan