In all, the speed increases are very much appreciated. No feeling of sloth there. They mean with screen at the dimmest setting, AirPort card turned off, processor cycled down and no disk activity to speak of. At the dimmest setting, the image works in a very dark environment, but that's good for typing and organizing only since it isn't bright enough for image work. It's lighter and thinner by far, giving the screen portion an impossible 6mm thickness.
People go nuts over it the instant they see it.
The only minor gripe I had so far has to do with the click pad below the track pad. It isn't as convenient to the side of my thumb as the previous body plan's curved contours produced. Some things just take a bit of getting used to. I doubt this affects many people at all and after getting used to it for two months the issue has faded from my horizon. More power per cubic inch than previous laptops.