I had the AM V4. Liked the ride a lot, though I agree on the flexy rear end. I know a lot of people like a bit of designed-in flex but I don’t. It’s a really capable bike though. No real weakness. Oh, except pivots loosening, as others have mentioned. What are you riding at the moment?
The downside of the Commencal, and the main reason I got rid of mine, is Commencal. A few bits fell apart. Clearly warranty issues, mostly with their own brand/rebranded kit. They couldn’t have cared less. The whole warranty experience left me resentful of the company and the bike so I got rid. Compare that with warranty experience from Giant and Specialized which made me want to go out and buy another one of their bikes immediately…