i just got a powerbook g4 last month and it was also my first mac. I build, use, support, and deal with users on PC's everyday, which may have something to do with me being sick of them and wanting to try something different. I dont really feel like writing something long but i'll just say i am very happy with it in every way. My only complaint would be that the stability of macos 9 is more comparable to windows9x than 2K. The unix-based OS X is very stable but still needs some work ( especially on laptops because of some power management issues).
I've learned alot about using macs and integrating them with a windows environment in the past month so if you want to know anything just ask.