As a long time airhead owner I know nothing about the flying bricks other that they have a stellar reputation for reliability. I plan to have a summer fling with one next year and then see where that leads. Winter is the time to buy, so I am looking.
The K1200GT is one that I covet, but the black and silver K1100RS SE is uncommonly attractive.
What should I look for when buying used? Is there any indicator about known weak points such as fuel pump? I know about heat from the K11. Are there other annoyances that could sway the decision? What about ease of maintenance? I do the standard maintenance on the airhead and it runs well.