I discovered the second gear bogging very soon after buying the bike this year. I've heard some say they haven't experienced it, but I certainly did.
So I got the Guhl flash at the end of July, and I can tell you that it completely cured that problem. The engine's natural torque is restored, and the bike will now drive out of 2nd gear even at very low rpm with no complaints. The power in the lower gears is significantly increased yet still linear and controllable.
In addition to the standard ECU programming,
I requested a fuel map for a DAM Exhaust and Cat Converter Removed;
Error code for stock exhaust servo motor removed;
Fan temperature reduced (which has worked out well)
I did not raise the rev limiter, as I saw that as a risk with very little or no benefit.
Being a perfectionist I also upgraded the rear and front suspension to dial in the proper settings (Ohlins rear; Traxxion AK-20 front).
I'm now really happy with my VFR1200. It's a great bike.