I own a G4 Powerbook 1.67/100g/1.5 ram and I have a close friend who has a 15 MBP. I have spent an great deal of time using his MBP and comparing it to my G4. Ok I know that it is faster and all that jazz, however, I don't think it really is that much faster. Now of course it is but to me I am not that impressed that I'm willing to give up my G4. You see he is offering to give me the MBP if I give up the G4. No kidding. Here is the deal we have sat the two computers side by side and went down the list, and truthfully other than the isight and the fact that it is thinner, I haven't really been that impressed. Now, the MBP is wonderful, and a great computer, I'm just not the keep up with the Jones' kind of guy. I guess what I am saying is maybe there are those out there who are driving those Rev d+ G4's who are wondering about upgrading. I'm not at least until the 2007 model's come out, or maybe not. By the way, I use the gambit, Photoshop cs2, Aperture, etc. and I don't have issues with speed. Just wondering!