I started using it but had other goals at the time so stopped, but at the moment in using something not too dissimilar which is static contraction training. I mention it as it was created by john little who co wrote body by science.
I am doing what would be an army pt session bit instead of reps in doing static holds for time. IM not going to failure (well im adding weight to pushups/chinups and so far havnt failed) on any set which is why I can train more than once a week.
It isn't the mountains ahead that wear you out....Its the grain of sand in your shoe.