I bought an mt29, sent it straight back once it came out of the box and I’d given it the once over.
I’m lanky and run my seat posts a long way out of the frame, the 31.6 seat tube wasn’t, it was a flared section at the top, not deep enough for me to insert a ks i9 125mm dropper much beyond minimum insert (a few mm only, 10mm -15mm past minimum insert would have seen me happy) *just* fine for pedally racey high saddle but a comfy normal height wasn’t achievable without dropping the post a bit or switching to a shim and 27.2 post. no good for anyone who might want to push the post in all the way to the collar.
I swapped it for another Lynskey (29er pro) it’s not cracked yet and I’m not delicate. (Also 27.2 but sliding dropouts etc, without dropper compatibility the mt had no advantages and a few minor disadvantages)