I’ve run 2.2 RQ USTs front and rear on my Five and I really rated them. They’re not black chilli in this size though. I’ve since had 2.2 UST Nobby Nics and am now on to 2.35UST High rollers.
To be honest they’ve all been good although the HRs and RQs are probably the better of the three.
If I could be sure that the non-UST Black Chilli RQs would work well on my 819 rims, I’d definitely get them next time.
The UST HRs are lighter, which is why I’ve ended up with them now and will probably stick with them
I’ve also got non UST HRs on Mavic 321 rims (running ghetto tubeless) on my Orange Blood.
So in summary, the HR USTs are good, the non UST HRs are also good tubeless and the Tubeless RQs were also very good.
Hope that helps!?!?!?!