Anyone tried this series?

iamMLH

I've come across the Foundation Training a few times, and I've done some of the free workouts and think they are really helpful (I tend to struggle with hip, back and knee pain if I'm not really careful).

There are a handful of free workouts on youtube that I have done and will continue to do, but I'm not sure about buying the full set. Does anyone have experience with the full program? Thanks!