I bought one.  I already have the original version of the X-Arcade stick, and like it pretty well.  I plan to use the extra space on the side to throw in a couple of spinners.  I'll be a little odd to have one spinner on the far left, and one on the far right, but at least the controls won't be too cramped together to use.  I also have a SlikStick, and using the spinner or the joystick on the top row are a little bit of a pain, sometimes.  *shrug*  I am looking forward to trying the trackball on this new x-arcade unit!
Later...