Heavy indeed. But if you yust ride and do not need to carry it, no sensible difference to my old (2019) RM Powerplay Altitude C50. If I add the range extender to the Rocky (all together marginally more, 830 Wh) it is roughly the same weight.
I tested the top variant 2 weeks ago and was very nicely surprised. Very smooth and nicely configurable power output, not quite so strong as the RM in "ludicrous" mode against peak setting (Pinion calls it "fly" mode) but more than plenty for the steepest climbs I could find.
What turned out to be the most the tempting feature (for me) with the Moustache: very short first gear. You can use the low gain mode most of the time.
All other competitors with MGU use smaller sprockets on the rear wheel. You can almost never use the logest 2 gears (except downhill without motor support) in 25 km/h legal areas, imho a bit of a waste of this great gerbox. It shifts absolutely perfect. Well, except the automatic mode, I yust cannot value this feature because it is not /cannot be/ as predictive as you would need in tehnical terrain. MGU says ist is no problem for the gearbox when shiftig under high pedal pressure but it feels odd when you pedal forcefully and, bang, gearbox shifts...