There are Facebook groups with Zoe members which you can join even if you are just interested. I found it helpful to see what people were saying about their experiences and understand more about the real experience. (Allowing for the fact that a lot of people get on quietly if things are going well for them so you probably see more people raising issues etc. than would be representative). Might be worth joining and browsing on there.
People seem to be getting revised gut scores recently which are often dramatically different due to new 'discoveries' with the science - has made me more wary of it to be honest - I think it's a work in progress - if things can change that dramatically in a short period of time. And also wonder how relevant to have a gut score is as bacteria in gut etc are constantly changing so one day it would be different from another.
There seems to be lot of weighing and recording and it is quite time consuming. It seems like a lot of people doing well with it are people with time on their hand - (retired/wealthy folk) - because of the cost to join and the time required (as well as perhaps its the stage when people are wanting to focus on what else they can do to improve health even more and they have time for it)
The fact they've teamed up with M&S to produce a yakult type drink released this year has also made me wonder about how scientific/independent they can be/remain if they are starting to produce products themselves which they will also be giving their Zoe followers a 'score' for.
Interesting idea. Seems to have helped a lot of people. But it does seem to come down to eating healthy, whole foods, plenty of nuts and seeds, protein, less sugar, little meat and including more fermented foods (kombucha/kefir etc). Would the weighing/scoring be something you have time for and would get into? I would start with cutting out junk and eating real foods as a start before committing due to the costs and the technical issues, plus it sounds like the science is evolving so not totally convinced it's quite a sound science/indvidualised as they promote yet.
I've found the Ultra-processed people book and other ultra-processed podcasts quite motivating without the need to pay the Zoe charge!