[ThunderCactus]

no, but I've used a ryusoku baton and I'd say it works better than the M-nub, at least in theory.
Because it's round on the arm side, it's actually maintaining perfect perpundicular pressure on the Rhop. Whereas the M-nub maintains slight angular pressure.
The difference probably isn't even noticeable, but it would be worth trying a side by side comparison

Also, update, what I'm getting back from the half dozen Rhops in the field;
Most of them are just noticing greater accuracy, not particularly better range
one noticed a "fantastic range" difference, likely because his PDI-W was too tight on the seal and preventing proper feeding lol
And one noticed a big difference because his hop rubber was both stock and crap.