Right on schedule, another "worship" thread of the formulator has popped up on the Gripboard. My opinion? Save your fuking money.
Make your own devices, do your levering with a sledgehammer, include block weights, and finish with towel rolls. Also pay attention to John Brookfield's FREE tips on the Ironmind site.
EDIT: The thread has just been locked. After observing similiar activity, it seems much of the Gripboard is getting fed up with the sanctimonious "lecturing" by the wannabe inner-circle crowd.
Hopefully we will see the end of $100.00 ropes, wrist gadgets made of toy metal and overpriced public domain brochures. ;)