Looking around, I can find a few documentations about this rootstock. Apparently they trialed it in Illinois, which you can read about here:
It seems very highly susceptible to bacterial canker according to them, which would negate its positives. A Royal Crimson cherry I planted last year is absolutely inundated with bacterial cankers, and would therefore try to avoid this (the only tree in my entire orchard so far thankfully).
I addressed this issue in a different thread https://growingfruit.org/t/sap-leakage-on-royal-crimson-cherry/