> I have a brand new k790a (same vintage as the k800) and I have found the
> joystick to be quirky often. ( you want to press the button, but it
> registers as an "up" or "down" and you end up selecting the wrong thing.

Oh yes, I get that as well. I don't know if it's over-sensitive, or needs
re-calibrating, but sometimes I push it down for a slow scroll down and it
registers as a right-push, which is a fast scroll down. Extremely
irritating.