I went to try one at the local HD dealer here. Prices weren't very reduced or anything but wanted to try the thing before it becomes impossible...
I was lend an XB12 for the demo.
Took the bike thru some corners, 5 kms of motorway, downtown, just to get a (really fast) image of the bike.
My take on it is:
vibrates like hell at low rpm. really badly and not a very satisfying vibration, more one that would do your fillers no good.
front fork quite unstable at speed. wouldn't trust it.
position is rather mandatory and pushed up at the front.
braking is not bad at all but the lonely perimetrical system really makes the bike dive out badly when applied in corners (which sometimes you have to)
sounds terrible when legal.
warms your leg and ass and got a terrible fan noise when the bike is hot and you just switched off.
the good points:
should be very fun in the twisties
i really liked the injection set up at low rpms, you can really ride the bike on a light throttle
engine is fun
handling is light and precise (altho i wouldn't trust it at higher speed)
Would I get one ? naaa, didn't do it for me.