Except for Max. On the SIG P320s the 6MOA Romeo1 that's compatible out of the box is pretty hard to beat, but Max never liked the shape of the lens and wanted something taller. He pretty much used the R3 for the past few years while working with SIG on the back end to tailor a sight to be exactly what he wanted. I was surprised that he wouldn't have built it off of an R1 but the result looks great, albeit awkwardly not directly compatible with the Legion.
It will be interesting to see whether it ends up being widely used given that it was specifically made for USPSA type shooting. I know a couple of guys who had already moved to using the original R3s on their Open guns already (they were sick of RTS2s breaking), but there's so much more to like now with the huge, bright dot on the R3Max.