Roel,
I agree,
I love the kn5000 and kn6000 (getting one very soon) so far. Very reliable, they take a beating and keep on ticking. I gig every night with the k5 and the Tehinics is a pleasure to play and the syles are awesome especially big band, latin, waltz, world, r&r, disco, ballads, with eth right sounds and tecnicord setting it's hard to beat. I read alot of posts and IMO too many people are too critical of the their instrument without having enough experience to even play it. Some expect too much, but it's the Player not the instument most of the time. I have been playing professionaly for 34 years I'm 48 so do the math. Yes, I was giging at 14 with the older guys. Be a good player first and then worry about being a scientist and working a good arranger keyboard like the Techinics K5/K6 Yamaha 9000, Korg i30 etc.
good luck to everyone out there and play music every day!

Donny