I think a major concern in any new design and hopefully something that can be retrofitted to our current Book Port's should be more rugged battery clips. I got my Book Port around the 10th of March and am already having problems with bent clips. I have only changed batteries two or three times, but when my Book Port has no batteries, the clips rattle, and it got to the place where I was not able to make and keep solid contact with one of the batteries. I also notice something in my Book Port which I don't notice in my wife's unit - the top piece of metal with the earphone connector and the USB cable moves back and forth just a bit - no problem with connections but odd.