Oddly, I was introduced to the old forum after a "search" for Kn5000. I had just bought a used one and needed to know what people thought of them. That was so long ago - I can't even remember what I was playing at the time ! I think it might have been an E86 or my i5s. Can't remember.
The search result provided a post entitled:
"The kn5000 is the best keyboard in the world" - ..... wonder who posted THAT!