My impression is that Shimano carbon wheels are nice, but they are always behind the curve, e. g. deeper wheels were late compared with competitors and the inner rim width was very conservative. Weight-wise, they were not standing out either. The price was alright, but more expensive than e. g. Hunt. So to me it seems Shimano carbon wheels are boring, unremarkable products that don’t stand out in any way.
It is a bit of a pity as Shimano hubs have in my experience been bombproof. I have been using Shimano SLX, XT and XTR hubs for almost three decades now. I have never, ever serviced one of them, nor did I need to. On my previous mountain bikes, the hubs outlasted the rims after 10 years of use with seemingly no degradation in performance.