I am 5’10” and test rode the large and medium then bought the large. I had to have too much post out in the medium, but love the fit of the large.
I would budget for replacing the tyres, I also replaced the forks after six months with some x fusion slants.
The rear shock was blowing through the travel with a high volume air sleeve on it, I improved this massively by adding a shim cut from a milk bottle. This is a five minute job.
Bike is quite heavy but goes up hill fine and feels very solid and stable downhill.
The yellow on the AM4 is also much brighter than shown on the Commencal website, which makes me happy 🙂