I just received my 17" C2D MBP this morning, and I must say that there is not a significant difference between the new C2D MBP's and the original CD MBP's (in terms of speed and quality build) 1) The heat is still present! The machine does not run "cool" by all means. As to whether it runs cooler than the CD MBP, only by a hair if not the same. 2) Build is about the same: MBP's are still shipping with bent keys on the keyboards, uneven backlighting, major gaps between the display and case when the lid is closed, and weak display hinges among other things. 3) As far as speed, I have not noticed that my C2D MBP is "FASTER" than my old CD MBP. It runs very similar to my old machine (but that might change with Leopard, only time can tell). 4) The wireless card in the new C2D's has much better range as I've noticed. Sorry CD MBP owners... So for a conclusion, CD MBP owners shouldn't beat themselves up now that the C2D MBP's are out. Your system is just as good!