I disagree.
I went all Mac for one year and it worked, but I still preferred Windows so I sold the Powerbook G4 while it was still worth something. I have a couple of Macs lying around still, but only because I got them for next to nothing. I'd never buy a new Mac again.
As for the hardware, the Intel machines have alot of hardware identical to what's being sold in PCs, but they aren't generic boards.
I also purchased
PowerBook G4. For the period I own it, it turns out that the laptop is switched off sometimes even for weeks, while I use my Amiga on daily basis. The Mac OS X is just not attractive to me, but may be this is because I used Amiga for more than 15 years almost everyday. Hardware wise, Macs are expensive, so if I go for new non Amiga based computer, it will be Windows compatible PC, not Mac OS X compatible PC (Apple).