I'm doing the 12-week rotation, though I'm not following strictly especially with the recovery workouts, since I also do a lot of yoga. So far I've done all the Total Body workouts, most of the Upper/Lower, and most of the recovery workouts; I've liked them all, Total more than Upper/Lower, but I appreciate the variety. I am doing premixes to keep my workouts around 30-45 minutes; I love having that option, and the premixes are well done - you can meet the spirit of the rotation, doing premixes, which isn't always the case! (I remember Cathe saying these would be shorter workouts, but they're not short.
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There is lots of chatter in the check-in - drop in and see what we're saying about these! The response is generally very good.
ETA: As others have said, it's intended for hypertrophy and most exercises are in the 8-10 rep range, a few 12 (those are mostly with bands/tubing, I think). I am not using barbells, just dumbbells and tubing, and that's working fine for me. (I have dumbbell pairs through 25 lb and a single 35, but I don't lift as heavy as Cathe.)