I have the NASM CES cert. I think that it’s great for integrating corrective exercise into your clients program. I thought that the course was very thorough and simple to understand. Just as Denny mentioned, the course includes a variety of materials in addition to the text that clearly demonstrate how to make practical use of the assessments. The course also includes a ton of pre-programed workout charts for all the movement dysfunctions that are covered.
I initially tested this stuff out on myself as I was a little gunked up in a few areas. I can vouch that the program works and is worth every penny.