fcaeiro,
If you're refering to my "mono" mod. The advantage for my R100GS is that it will make the drive shaft bearings last longer by reducing the angle that they have to work through. As far as I know the 1100 & 1150 don't have the same shaft life problem as the 100GS.
It has the by product of making wheelies easier because the whole bike lifts slightly under acceleration. This makes riding "off road" much more enjoyable.