I've been reading about KTM 990 Super Dukes on another site. I really like that bike and am contemplating the procurement of one, but many reservations.
6-10 hours to do a valve job. Supposidly easy, but time consuming. No biggie. there is a period of aprox 6 weeks where I live that is unrideable, so I can deal with that.
There are reports of engine cases leaking because of poor castings. Pin holes in the engine in other words.
There is the occational puel pump quitting for no reason, brakes that don't, and a few other little niggles. For $13,000 you'd expest better. A 919 is half the price and no problems. Not the most thrilling bike, a 919. But they do a good job and are hard to walk away from.