Haha, yes it is quite a beast. It's really more of a portable desktop machine than something you'd use on the plane. That said, it's one of the fastest gaming notebooks out there to date.
At around 10 lbs with battery, it's not something I'd want to carry around all day.
While the PowerBook will not match its gaming ability, I've decided that portable gaming just isn't something I need. I've got similarly equipped desktop machines at home that fill my gaming needs, and my daily commute by train has me looking for something more practical.