When I became a PiYo instructor I got all of the PiYo videos. I am also a Turbo Kick instructor and have many of those videos. Jonahnah is right about the videos. They are all very good as instructor videos to learn the choreography to teach a live class, but as for a workout...BORING. I have tried at times to use the PiYo videos for a workout (Turbo ones too) and only made it a few minutes before I was so bored and restless that I had to put in a different video to complete my workout.
My opinion is that you would be better off spending your video dollar on other videos if the goal is for a workout for yourself. On the other hand if you are an instructor looking for different ideas the PiYo videos can be useful.
Good luck,
Shayne