I have Yoyodyne unit on my 748, and it is very well made. But I purchased a Norton SP unit for my SS and prefer it. It is more compact [larger bore, shorter length] than any other units I have seen, and the machine work is awesome. I feel the clutch pull is even slightly more reduced than the Yoyo. It is available from
http://www.ducati-shed.com Although located in Germany, Kelvin is a straight-up guy. I paypaled him the money [129 Euro= $163.83, todays exchange rate,] and had the unit in a week. Another possible benefit, is that it comes in four different anodized colors.
He has a few other interesting items on his site for Ducs and MV's, I would suggest checking it out.