I have been a member of GISFW for a year and have to say that I am much stronger than I have ever been. I love the trainers, Mike and Alex because they make sure you use the right form and motivate each of us to succeed and meet our goals. I think that It is a well thought out program that is challenging and keeps you on track. Accountability is the key and they make you feel accountable with scheduling your times to work out and showing up. You also weigh in each week.
I would highly recommend GISFW. It has worked for me.