I’ve been using the PowerBook for a few hours now. It’s quite a bit faster than my G4 minitower.
I’ve posted a picture gallery here and a first look article at MacMegasite.
I find that it’s getting quite hot. I had the problem where the charge indicator light remained amber even when it was fully charged. I unplugged it and ran it until it shut down, and I’m now recharging it (58 minutes left).