I have tested it, and I can't get it to work properly.
When I use the stable version, I have gsm signal, but I cannot make calls and have no wifi.(Disable sim pin otherwise It won't work at all)
With the nightly I have no gsm signal at all, wifi starts scanning but doesn't find any wireless networks.
without internet, not much you can do.
I wonder if it has to do with the radio versions?
As for the rest, it's quite buggy and laggy but doable.
I just don't like the way they implemented the pre's hardware button/gesture area :s