I have had V9 installed on my GT. The result was very very bad. The bike is un rideable. The neutral RPM gets blocked at 2200-2500 RPM when the engine is warm. You have no engine brake which is bad when you count on it.
In slow riding, the RPM gets stuck, then you pull in the clutch, it goes to 3000 RPM, goes down to 1500 after a second, release the clutch and it goes back to 2500 with the gear in.
I have just spoken to BMW Belgium about it. Bikes that have been built before December 2006 should have their airbox and air filters replaced to avoid these problems.
It is also a problem that the computer at your freundliche will not diagnose any fault, because the problem is not electronics, but mechanical, and will only occur when the engine has been running for a few hours.
My freundliche is closed today but I am sending him a mail to get in touch with BMW Belgium tomorrow first thing.