I had them on my SS 29er for ages with zero problems, but they were the OEM eyeletted versions and nearly symmetrical hub flanges.
I’ve now got Crests (mk2?) on my CX bike, and building them was a PITA, there simply isn’t a way to get enough tension into the non drive side at the rear. 28h with novatec hubs.
In the end I just thought f*** it and went over the recommended tension to build a reliable wheel. At some point they will pull through. Then I’ll replace it with a WTB i19 asymetric, same width, 100g heavier, and even spoke tensions!
I’m 90kg (was 110 at one point on the SS though).
For 650b at your weight it’s probably fine. I would maybe keep an eye out for 650b version of the WTB rims in the sales, it’s the same ERD too IIRC so if it ever does crack then it’s a straightforward swap.
I’ll caveat my positive review by saying I only paid ~30% of RRP. So if they die then they owe me very little.