Paul
All GS`s sit at m/way speed no problem. My 56 plate GS-A has done 36k and is as sweet as a nut cruising up to a ton. I have a Touratech screen extender to stop any buffeting etc and that`s a godsend as I can run with the visor open if I need to
You`ll open a can of worms with the 1150/1200 debate but here is a level headed opinion. I put 35k on my 1150 GS-A so I am qualified
The 1200 is lighter, has more power, is more responsive on the throttle, handles better, is comfier, better on fuel and crashes well

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The only advantage I can really see of an 1150 is it doesn`t have all the electronics which can go wrong.
Contrary to popular belief, the huge majority of 1200`s are utterly reliable and I`m yet to be convinced they are less reliable than an 1150
I love them both and would have no hesitation going back to an 1150 but boy, I`d miss the power.
I think it`s a matter of personal taste and maybe wallet and oh, I reckon they are both butt ugly but in a handsome sort of way