Mine arrived this week, I'd had to wait about a month for delivery.
The criticism I have is that the wireless networking drivers installed were useless and failed to work with my network (I'm using an Apple Airport Express as a wireless hub) as apparently they don't properly support WPA security. The solution to that was to install new drivers as shown
here.
That got me on my network easy as pie.
I do find it possible to type reasonably well on the keyboard with just the odd mis-keying, and this will get better as I get used to it.
Battery life is a bit short (3 hours with the wi-fi off, 2 and a bit with it on), but there are extended life batteries coming on the market which will extend that (I've heard as long as 7 hours).
Because the battery just clips on the back it would be easy to carry an extra battery for long journeys.