I finished all the lessons a few weeks ago (402) and, for me, definitely worth every penny. I have lost about 5kg, mainly around my waist (yeah!!). Feel fitter and happier in my body than I have for decades, lots more energy. Loving the variety of new foods I'm eating, trying new recipes, eating different carbs and fats to the ones I used to eat - but not feeling deprived. e.g. swapping oats for barley and eating edamame pasta rather than wheat pasta, only using Extra Virgin olive oil for cooking.
As others have said, it's not a quick fix diet (though my initial weight came off really quickly and then just stopped, who knows whether I will eventually lose more?) but it's sustainable for life. I've been out for a few meals while doing it, Indian, chinese, Thai, Wagamama, middle eastern .... not at all problematic to have a lovely meal, with wine, and still feel I'm eating sensibly - doing things like choosing to have nan rather than white rice with my curry because my body deals better with wheat than rice.
So, worth every penny for me. I have taken it seriously though, listened to the podcasts, read the books, looked at the science. I decided that I trusted the product and went with it, concentrating on the gut microbiome.
I joined one of the FB groups -but do get a bit exasperated with people complaining that they are being encouraged to eat food they don't usually eat or cut back on foods they really like (sausages was the best!).
Some people really seem to have lost loads of weight - I'm guessing they are the ones who have made the most radical change to their diet - some a bit, like me, some none at all - and some people have put weight on. Maybe they were on a restrictive calorie controlled regime before and their body had adjusted its metabolic rate to compensate? maybe they are eating their weight in salted nuts every day?
Who knows? the one very clear thing is how different we all are, there is not an easy "one size fits all" model, but the Zoe analysis has definitely helped me understand my own body better and hopefully head off some of the health issues I might have faced had I continued with my old way of eating.