What is GREAT is these young people getting involved with arranger keyboards, and also having the maturity to realize that the choice is a very personal one. So far the 9000 works best for me, and I need another sport besides golf anyway. :>) But having played the X1 and the KN6000, I can readily appreciate that they have wonderful features, some of which I wish mine had. But I choose the 9000 because ITS feature are ones I feel I need most.
In order for these companies to continue doing the research and development to produce newer and better models, we need the younger musicians to be involved. There are just not that many of us "old pros" buying one keyboard every year or so to support the market.
Don