I got my 6K two days ago and the display is amazing.
But I was disappointed to hear that it still has that blasted alarma300 wave file as the default sound and that it can't be changed. I was obsessed with finding a fix for it on the 5600 and never did find a solution. It appears as though the 6000s have that same sound.
I really hate sitting in a meeting with Palm and WinCE owners and having my alarm go off. Hey, look at me, I run Linux, MySQL, Apache, X11, and all kinds of freaking other stuff but I can't change that sound!