My hamstring flexibility increased by 37 degrees in 9 weeks. I measured it with a goniometer at the start and end of the program. The difference in my running stride is obvious on video.
I used to need 48 hours between hard workouts. After adding the recovery sequences to my routine, I can train intensely with just 24 hours rest and my legs feel fresh.
I haven't had a single overuse injury since I started doing the knee stability program 11 months ago. Before that, I was dealing with patellar tendinitis every few weeks.