I purchased both Powerstrikes, that is, I and II.
Powerstrike II is visually very good. The moves are easier to follow because the leaders are clearly the focus.
Powerstrike I is a different story. The cameraman got all artsy-fartsy about his work. Some of the angles make it hard to follow, the film goes into black and white then back to color, sometimes the class gets shadowy. I suppose he thought this was very clever but the result is a workout that sometimes becomes difficult because it moves so fast and if you don't have a lead to follow you are left out there with photography that is too busy being "cute". It is a good workout, similar to II, but I find the camera work annoying.
Just my two and a half cents.
Marlene