I've been following this program quite diligently for 4 years now, and have been plateaued for really most of that time. (I've been trying to get to 5 sets of 15 pushups really since almost the beginning. I've been trying to get a single deck squat for more than 3 years, I still need about 3" of panel mats, etc.).
Recently, I've started doing a number of other exercises to supplement the ones in the program. I've started to see some progress again for the first time since forever.
I think that advice should be made front and center, particularly for people who don't have a real strong fitness background.
I'll stay with it because I do think the exercises in the program provide a good back bone for a fitness program, but, at least for me, they aren't sufficient for progress.
I will say though, the feed back on this forum is TOP NOTCH. Coach has wonderful people monitoring this.