I tried posting a response earlier today, but my browser ate my reply.
My recollection from following this stuff since 2015 is that the V1 PL23s and V1 SL23s were the most prone to cracking, the latter mostly in low-spoke-count 700C form. The V2s of each seemed to be much better, but not perfect. Perhaps low-pressure 650B tires are kinder to the wheels, so they are less likely to crack or go out of true? I've got nearly 3000 miles on my V1 650B SL23s, with a reserve set of V2 rims for when those wear out. Great stuff.
I wonder what Kirk will be up to next!
- Scott