I like the idea of a pyramid style workout to bust through plateaus, but this style of training is very different in the gym environment than on a video. In the gym, pymrad training falls into the category of High Intensity Strength Training and is designed to bring the muscle group to total failure with the assistance of a personal trainer to spot the client through the reps. It is not meant to be done in a superset fashion as in the videos, but without the help of a home personal trainer, this is the next best way to fatigue the muscle group without a spotter. The goal of a pyramid style workout is to recruit new and differet muscle fibers due to the lack of rest. The fatigued fibers in a normal strength workout recover during our rest sets and are used again in the next set of the same exercise. But without any rest in between sets, new fibers are forced to be recruited when their predecessors tire out.
My take on the pyramid upper body workout is that with 1) a full pyramid set, and 2) a superset of two exercises done back to back for the same muscle group, a lot of stress is being placed on the muscle groups and connective tissues with so many sets/reps. Also, the smaller muscle groups like shoulders, biceps and triceps are getting plenty of work with the chest and back exercises so by the time we reach them in an isolated fashion, they are pretty much toasted. Therefore, the PUB workout would best be done by either 1) Doing a pyramid up only series for all exercises or 2) Doing the full pyramid for chest and back, and a half pyramid (up or down only depending upon how you're feeling) for shoulders, biceps and triceps.
Tackle the abdominal/core section (which is excellent) later in the day or on another day, after your muscles have recovered from the pyramids.
PLB is different in that the legs can take much more "abuse" than the upper body. I have many barbells at home and set them all up for different intensities, so never have to struggle with set-up in between sets. This makes the workout SO much nicer! :7 I found that when changing the barbell, my mental math skills failed me (those darn 7.5 and 2.5's!) and I never started on time with Cathe and her amazing crew!
-Roe