I have not but have considered it many times
please keep up posted!!!!!!
I decided to do it because my exercise is almost all running, and this seemed to be a good program. I want to shave some time off of my marathons, and thought I would try something different. So far, so good. Only been a week though. It's supposed to get really rough the 2nd month.
On thing - there is a lot of jumping around, so if you have weak knees you will want to be careful with those parts - make sure you do all the stretches and know your limits.