I have it and keep meaning to do it. I have just re-started so am going to finish it this time! Am sick of weeing with every sneeze. It is a good workout and I have seen improvement already. You're meant to do a 30 min brisk walk every day which I just don't find possible - with kids in tow it's not brisk, and I don't have much inclination to go out on a walk once they're in bed. But the exercises and theory are good. For me it's just a case of actually doing it and being consistent ha.
Also the woman is quite annoying but there is the opportunity to mute her. And the 'mutu mammas' speil is quite irksome too.
I am on week 4 ish, but spread over a couple of months because I do other higher-impact exercise too and it's just too much. I have noticed some improvement and definitely feel the workouts the next day, but I am using a pelvic toner too so hard to tell.
I do pilates for fun and haven't noticed as much as an impact with that so I do think the pelvic floor focus of mutu is good.
Sorry, mixed reviews!