My HP2 is in the states, the GSA in Germany, so any input is based on not having the option of which bike to ride.
I am planning on bringing the HP2 over and trying Markus' tank and some Zegas.
I think the GSA will never see offroad and maybe even see the flea market.
Although I may buy a 06 1150GSA as my sport touring mount, which is what the 09 is now.
Not much help here.
Hope is not a course of action.