I've just realized that. - 320M > 9400M > IntelHD - on MBP 13": You get the 320M all the time. Battery rated 10hrs. - on MBP 15"/17" if auto-switching is turned ON: You get the IntelHD most of the time and the GT330 only when launching heavy stuff. But the typical browsing/mail/itunes users will have the GT330 off most of the time. So for most of the time, those 1799$-2xxx$ users will get a worse GPU than the MBP 13" users. - on MBP 15"/17" if auto-switching is turned OFF: You get the GT300M all the time, but you waste battery life for simple tasks. It's less "optimized" than using the 320M all the time. - on MBP 15"/17" if one day Apple WILL enable an "IntelHD-only mode": You get IntelHD all the time, worse than 320M. So mind that if you're gonna do web browsing, office, PDFs and itunes 90% of the time. Of course here I'm talking about the GPU only, one could have other reasons to choose the 15"/17" over the 13" (screen, CPU, etc.).