I'll be publishing a review to Gadgetoid, probably a first impressions with unboxing video/photos first, as the Pandora is a complex and full featured beastie that'll take a while to give a well rounded opinion of. The forums will be ablaze with either unabated whining about small things, or unending praise.
I can't imagine having anything much bad to say about it, though... there's really no basis for comparison- I mean the Dingoo, Wiz, GP2X and even the DS/PSP with homebrew aren't going to come close... and mobile phones, well they're just not trying to come close. Even with a game-grip on an N900 or *insert Android phone here* they are, at best, going to achieve some pretty poor controls in comparison.
It's fair to say that most of us will be pretty biased toward the Pandora, I mean if waiting years in a pre-order queue, having given up money, doesn't qualify us all for godly fanboi status, what does!?