hi, for what its worth --i went through a few brit, jap and italian bikes before coming to the 1150gs adv, all pimped, and it transformed my biking to many trips abroad, esp as my brother moved to zurich which meant lots of alp, italian lakes and corsica riding

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but then i was one of those that swapped the 1150 for the 800gs before launch.
the F800gs is a great bike and i love it, added sat nav via auto com and a TT tank bag and i was away. last trip montelimar the home of nougat in france, and i did the trip home in a day.
the only thing i miss is the adv tank range. but its nice to have the excuse to stop fill up and stretch my legs and have a choc bar.
it does two up well, but i've not done 2 up fully loaded tho, but can't see why it shouldn't cope !
oh yes its a BM with a chain, and touch wood or correct tensioning - no problems there.
its not too heavy, goes really well, and is so much fun!
give it a go.
H