Well, Inreb... to quote you..
" still using rubber mounted Sportster based engine. That was a make or break decision for the Buell company."
it wasn't a Buell decision to continue using the Sportster lump. So, it's not your opinion. It's fact. The XB still out-accelerates almost anything from a standing stop to about 50 mph.
Agreed, it rides too much like a Harley lump than an i4 sport bike.
And to Downunder... from a Nicolo Canepa interview:
"“So far, I haven't discovered any major problems with the bike, I think last year it didn't show its full potential,” said Canepa. “I just need to do as many laps as I can to get a good feeling of how the bike reacts to setup changes, and get accustomed to the perimeter brake in the front.” Canepa has been testing two bikes back and forth, one fitted with the original perimeter brake configuration and the other with usual Brembo twin-disc setup used by the rest of the competition. “I think we'll use both during the season, depending on the circuit,” the Italian observed. “Some tracks flow more and therefore will allow us to take advantage of the perimeter brake. For example, I can hold the brakes much deeper into the corner and the bike keeps the ideal trajectory. On the other hand, it lacks some power. If only I could mix both...”
So the perimeter brake has valid advantages and disadvantages - not total junk as you claim.