Hi Ruttly
I've run up 2600+ miles on it already , Its like a smooth Savage . 72mm piston , 86mm stroke , two valves/cylinder , nice counter weight and such a heavy flywheel that it does 4 compression strokes after its cut off , from an idle.
Its SOO SMOOTH ,
Its also a little heaver than the Savage , but sits and handles the same
Not having Super-Slab speed is the only thing missing. But I live 40 miles from the interstate so I don't miss it. 6100 rpm is max power , about 80mph , so one could hold it wide open against the speed limiter OK . That great fuel millage comes while doing back roads at 45-55mph. :'(

I've still got the Guzzi if I need an Interstate machine . The Savage taught me how important the "Cruise-Range" is when switching bikes. Last time I had a bike that got over 90mpg , it was a Honda CD175. And I was 18 years old.