I followed his program for 8 months and experienced slow, steady gains. It’s a good way to go if you work a lot of hours or don’t get enough sleep (like I did). I did, however, hit the stiff leg deadlifts too hard for too long and hurt my back. It took 2 years to heal and still “goes out” occasionaly. McRoberts does emphasize recovery periods to avoid this I just didn’t listen. I have made better progress by changing my programs at least every 4-6 weeks. If you have been training with a lot of volume, you will probably derive great benefit from it, but I would switch off when your gains really slow or stop.