The Macbook is superior to the iBook in every way, but one. I really miss having a 12" model. I've been tempted to pick up a 12" Powerbook as a secondary machine.
If Apple released a 12" Macbook, my 13 incher would be out the door.
Well, at least
two ways... the iBook's battery life is a lot better than anything Apple sells right now. That doesn't prevent me from wanting a Macbook, though.
My friend brought over her black Macbook last night and I was fairly impressed with the build quality, though.
In terms of long-term quality and functional quality... it seems to be a mixed bag. The most serious Apple issue in recent history was the logic board issue on the iBook G3, probably. In comparison, the iBook G4, as far as I know, never really had any major issues except the battery recall, which, as far as I know, was precipitated by few if any actual fires in products in consumers' hands. The Macbook has had the plastic coloration issue (resolved as far as I know), the peeling issue (seems some question as to how many units were ever affected), and the whining/mooing issue (also resolved, I believe)?
On the Powerbook front, my general impression is that the 12" powerbook was, like the iBook G4s, essentially problem free. The bigger powerbooks in the last generation had the screen banding / lining issues. The MBP in contrast has the heat and moo/whine issues.
All in all, function-wise, it seems like a wash. Apple continues to address issues and issue rates seem to be low in comparison to the market as a whole.