I have a Graphire BT and honestly the wireless is WONDERFUL. Even if my only indication that I need to update drivers is that it STOP WORKING COMPLETELY. Like it'll turn on and not turn off when I press the button and just blink at me like it's trying to connect to my computer...to which it is already connected. At the pen won't work. Updating drivers fixes it every time :T
I was expecting it to be pretty small actually because there was only "medium" and "small" sizes when I bought it, but it's got a 4x6 drawing area which is more than enough for me, and the thing itself takes up half my keyboard tray haha. i'd prefer a heavier pen with a grip but I can't really complain because that was all my grad cheddar and it works beautifully.
Only problem I have is that the surface of the drawing space DOES NOT feel like paper. At all. My friend's $100 bamboo has a nice rough surface that causes some friction which makes for better control over lines but my $450 graphire is pretty like drawing on slightly rougher than smooth plastic :/ I can't draw straight lines without them wobbling because the surface is too smooth. But I've somewhat adjusted and it's not so big a deal but man it gets annoying sometimes when I'm just trying to doodle and not really spend any time on something I'm drawing.