I have also done them all, but I think that "Tough Core" is my favorite. At only 18 minutes it really gets the job done. Some people think that the cuts between exercises in the premixes on Core Max are too fast and don't allow for adequate transition time, but I think it's probabaly an attempt to challenge your endurance, cutting out the breaks between exercises for the most part. I just get into position as fast as I can and chapter skip back to the beginning of the edit. I think I only have to do this in one or two places. Just be ready, lol!
Mattea