I just joined and figured I'd say hi.
Currently I ride a 03 CR250, and my 7 yr old son's on a KTM Pro Jr, but I'm going to move him to a KX65 in the very near future.
Somewhere down the line I'll pick up a desert bike, and the KX500 is one of 2 bikes that appeal to me for high-speed playing around (the other is the KTM550). Right now I'm still getting acclimated to being on 2 wheels instead of the quads I've been on for a decade.
My daughter just turned 2, so in about a year I expect that she'll be motorized, and at that point I'll get the wife a bike too. She actually had a KX100 last year but never even rode it.
I live in Visalia, CA. It's in the central valley. Hot. And flat.