I have an r1, they're supposed to have used the same stock on the lupo, talked to a rep like 1 month before their launch, honestly if the barrel twist matches what you're wanting to do, I'd take it for a spin!
I'm rather negative about it's looks. Makes me think of an overweight gal with droopy boobs. Stand up with the barrel down and you should get the picture. What ever happened to that famous Italian styling of older times.
Accuracy reports seem to be overall pretty positive, around the web. Not many thorough technical reviews to be found. A good review on youtube was in a diff. language, but I got more out of that than I did all the American covert ad garbage posing as reviews.