Apple PowerBook G4 user reviews (PowerPC G4 1.5 GHz, 512 MB RAM, 80 GB HDD, MacOS X 10.3)

Pros Large Screen, beautifully designed, user friendly OS, a plethora of ports and great features

Cons Stingy Warranty, keyboard positioned awkwardly

Summary I bought the Apple Powerbook G4 17" 1.5 GHz last July and so far it has offered uncompromised performance and functionality.
In terms of portability, the 17" Powerbook is most likely the most portable 17" laptop on the market. It's thin and light; however, it is a 17" laptop so there is not really a way for this computer to be designed to be more 'movable'. If you're someone who is going to be moving around a lot, be aware that it is a big machine (very thin though) and perhaps a 12" Powerbook might be more suitable.
Depending on your needs of the machine, the 1.5 GHz processor has handled all the tasks I have thrown at it wonderfully. However I am not a gamer or graphics designer etc. who is constantly running RAM heavy programs, so please keep that in mind.
The large 17" display is great for working on, as for most programs you can get two full sized windows open side to side and just look off both, rather than constantly switching back and forth. As well, for DVDs, the quality is simply amazing (if the screen is in reasonable condition). The pictures come out crisp clear and the color differentiation is great as well. The display is a definite strong point of this machine.
The functionality and ease of use of this machine is really a huge plus. Many keyboard shortcuts are available that allow you to do something as simple as switch programs up to spreading all your program windows across your screen in organized rows (this is the expose feature). As well there volume, screen brightness and keyboard backlighting brightness keys all on the keyboard.
Although this machine comes with a hefty price tag, I would highly recommend it.