I thought I'd post an update on my 06 with respect to vibration.
During the initial 600 mile break in, I thought it was kinda (buzzy), especially around 3500/4000 or so that you'd normally cruise at on the highway. (No I didn't do much cruising during break in).
Compared to the previous Inline-4 it was significantly more buzzy IMHO, though the harmonics on that bike, and buzziness come in at a different RPM Range.
Now, keeping things in perspective, I felt buzz *mostly* on the right side, in the right grip and definately in the right foot peg. I was also feeling this wearing my tennies. When I commute to work, I gear up in Helmet, Jacket and Jeans but don't necessarily wear boots to work. It's just a pain in the butt to deal with for the short commute. My break in tended to be some extended rides home after work however (again, in tennies vs. good riding boots).
At the 600 miles service I synced the throttle bodies, which really weren't that far out of line, but I did not check them at 4k RPM. (maybe I should have, they may have been out worse up there).
Also just before my 2400 mile trip I recieved the new guts to move my heavy Throttlemeister bar ends from my ZX11 to the Feejer, which I did.
Needless to say, I never felt during the entire 2400 mile trip that the Feejer was too buzzy. It was less buzzy IMHO that Zed. Did my right hand go numb? Only once that I can recall during a really long stretch of road that I was hitting pretty hard for a long, long time, and it wasn't that bad.
Buzz in the right peg was also all but gone with good boots.
No doubt the throttle sync and heavy Throttlemeister helped, but I'm sure break-in had a lot to do with it too.