I’ve been running he 29 crossrocs in the peaks since the summer. The quest tyres that came with them didn’t stay on long as they are a hard compound and scary on wet rocks. The tyres came up visibly narrower than the 23mm rovals they replaced.
They ride light and fast with a quiet freehub. I’m not a particularly aggressive rider but they’ve handled some abuse and stayed true as I’d expect. The tubeless rim strip works well so no tape required.
Other than the slightly narrow profile I’m happy with them although if I was buying again I’d be going for something with a wider rim. My dad bought superstar DS25s which are cheaper and well rated.
There was a brief review of the crossrocs in either MBUK Or what mountain bike last year.