welcome to the forum j2.
I'd say from my limited experience with my versys (1500 miles), but also reading a lot of the threads here;
1) front cowling vibration, IE a kind of 'buzzing' from the cowling. There are numerous threads and potential fixes on the forum.
2) motor being kind of rough. being a 2 banger, it's never going to be as smooth as in inline-4. Some have said that adding crash bars can lead to vibrations, I haven't experienced that myself with my Givi bars.
That's really the only 2 I can think of, maybe others will chime in.