I started NROL4W with (some) running in April and went through stage 4 with no beaks. (not recommended) I just stopped for a break last week and went to KettleBell and Cathe and running workouts.
The program is definitely worth trying IMO especially if you have been isolating muscle groups for a long time. I have been doing Cathe weight work exclusively for 10 years, and I felt a change would do me good. I will most likely go back to NROL4W. I am interested in doing stage 7 (cutting)
If you are an advanced Catheite, I recommend you go a little heavier to start with. I found the first stage easy because I probably started to light. If you expect noticeable results, it is important to follow the nutrition recommendations as well as the workouts.
Let us know if you do it. There is an Alwyn Cosgrove Check in over at the check in forum. it is for anyone doing Alwyn workouts, P90X & Kettle Bells.