The extra battery is probably the second biggest reason to buy the dock (after the keyboard itself). The USB seems to work find with wireless mice that I've used, so there's no reason for the trackpad as far as I'm concerned. Generally I've been very impressed with the keyboard, and have taken the prime on several business trips in lieu of a full laptop with no issues.
The GPS dongle looks to be a hideous debacle at this point. I've ordered mine since it's free and will round out the functionality, though I doubt that I will use it often since it precludes using a case.
is there a photo of the gps dongle?
I keep meaning to get a wireless mouse for it so I can check it out, thanks for the reminder. It does indeed make the track pad unnecessary. But, I dunno that even with a mouse I'd use it all that much. I find the touch screen to be a great medium of interaction. But, I am glad that I can use one if I want.
Gotcha, not a concern for me. Can't really notice them anyway unless you are viewing something that is mostly black. I'd rather get the touch screen functionality I paid for, which is one of the biggest benefits over a laptop. But, each to their own.