Hi
I did the switch a month ago. Now I own a PB G4 12" 1.25M RAM 80G. And what can i say, is beautiful, the only thing is the heat and the fan. I gets too hot under heavy usage and the fan kicks up even with using safari and a couple of tabs open..... I checked the activity monitor and CPU usage was around 7 or 8%. also i got iStat pro to follow all the temperatures up...they are under the normal ranges....
I was really concerned about the fan running all the time, specially knowing from my exgirlfriend's ibook, what was really quiet.....
I have been digging out all the internet for info, even when to the mac shop to check out other PBs in action and my conclusion is that NOTHING CAN BE PERFECT ANT YEAH, THE PBs HAVE THIS ISSUE WITH FANS RUNNING ALL THE TIME AND HEAT....
SO SOLUTION, GET USE 2, and try to use ur battery most of the time, to avoid noisy fans running....
cheers