Since some people like the opacity & some find it leaves something to be desired: How does it behave on different fabric types? For example, Rutland M3 often runs well w/ no base on 100% cotton, but usually needs a base on poly blends.
Also, what's the hand like? And how good is at maintaining opacity when printing through higher mesh?
(We're also thinking of trying Rio. We've tried the PC system, but those formulas require very precise mixing for the small batches we typically use, and thus hasn't been a good fit for our shop.)