Had one 1200 GS and four 1200 GSAs (still got a 2010 DOHC). When looking at a post retirement trip to North and South America I looked at my options and bought a 990 Adv and put the Safari fuel tanks on it.
Bike has now done 42,000 miles and is 15 months old. Faults on route .. one new front rotor and one rear rotor. Normal maintenance including one set of fork seals and one chain and sprocket set. I doesn't get any better.
I'm now going to sell my GSA and have just ordered a blue 990 Adv in case they sell out before I come back from Morocco in September.
I should add that the journey through the Americas was two up with full luggage including camping gear.