All I can say, and Don Guhl confirmed this, the Belgian version of the bike sucks.
It has a major throttle delay, what a z-bomb can't fix.
It doesn't open more then 2/3th of the throttle at all, because of the 115HP restriction, z-bomb can't fix this either.
It doesn't allow you to remove the exhaust-servo, z-bomb doesn't fix this either.
It won't allow you to go over 250KM/H, z-bomb can't fix this.
It has a limit of 8000rpm in 1st and 2nd, that a z-bomb can fix....but for Belgium it's useless because the throttle won't open further then 2/3th anyway in ALL gears!
Don't know about other versions, but on a Belgian restricted bike it's a waste of money, people are better of with a VFR800 instead, as it's faster and has the same top speed, also uses a lot less petrol.
A few months back a Belgian magazine (Motor & Toerisme) tested both bikes together and their conclusion was that the VFR1200 was not worth it's "promised" reputation as the 800 could keep up easily and even pass it.
I'm sorry, but those limitations can not be fixed with a z-bomb as they are baked in the ECU, either replace the ECU or get it flashed by Don.
I do speak about the Belgian version only, as e.g. the Dutch version doesn't have these absurd restrictions and the z-bomb could make a big difference.
I did talk to my dealer about this, and he also told me the Belgian restricted version sucks and only a changed ECU will bring the bike to life.
My dealer is awaiting my Don-flash-ECU to see if it's even better then a full-power-BE(HISS)-ECU....judging on what Don promised, it will probably be a lot better.
As my ECU is flying at the moment over the ocean towards me, I expect to be able to tell how much the Don-flash did.....and Don IS cheap for the work he does compared to a z-bomb.