Normally take what MCN say with a pinch of salt, but Michael Guy's verdict pretty much sums up why a sold my 1150GSA and bought an XTZ back in 2008.
Interesting that they chose to take the "Touring" version with the reduced suspension travel and seat height. Mind you, the lower suspension must make it aerodynamic or something as it has a substantially higher top speed than my regular version!
120mph - same as the GS?