The 13-inch VAIO Z is ridiculously thin and light. At 0.7 inch when closed, the body is about as thick as the thickest point on a , though the VAIO Z doesn't taper as Apple's ultraportable does. It's even lighter than the 13-inch Air, too, at 2.5 pounds. This is due in part to Sony's having made the body out of aluminum and featherweight, durable carbon fiber. It looks good, and it feels good. And despite the laptop's incredibly svelte size, Sony crams a full-voltage Core i5 or Core i7 processor into it. Our review model came with a Core i7 2620M and 4GB of RAM. It also carried a 256GB solid-state drive, and the combination powered the system to a very impressive WorldBench 6 score of 138--one of the highest scores we've seen for an ultraportable laptop. Amazingly, the battery lasted for 5.5 hours, about an hour less than the batteries on most have managed, but quite impressive considering the horsepower under the hood.

Sony loads this thin system with other goodies, too. You get a VGA port on the left; a pair of card readers (for Memory Stick and SD Card) along the front edge; and an audio jack, gigabit ethernet, HDMI, and a pair of USB ports on the right. Sony used Intel's Light Peak technology to turn the lone USB 3.0 port into a special high-speed connector to a thin dock that houses the optical drive (DVD or Blu-ray) and a discrete Radeon HD 6650M graphics card with its own set of video, display, and USB connectors (including USB 3.0). The base-model VAIO Z--with a Core i5 processor, a 128GB SSD, and a 1600-by-900-pixel display--will set you back about $2000. Our review model packed the aforementioned Core i7 CPU and 256GB SSD, plus a 1920-by-1080-pixel display, all for about $2500. The 1.5-pound dock is included with the package, though the type of optical drive it contains may vary.

Though many people have called the media dock port a connector, it isn't one. Thunderbolt is the port that eventually emerged from Intel and Apple based on the company's Light Peak technology, but with a few changes. Light Peak was going to come to market using a USB port and an optical cable, as in the VAIO Z, but it underwent some tweaking before its designers settled on a mini-DisplayPort connector and copper cable. So Sony's implementation, though it uses very similar technology to Thunderbolt, will be incompatible with Thunderbolt devices. It is essentially a proprietary dock connector, but it also serves as a USB 3.0 port, so there's no wasted space.

The glossy display is impressive, with bright, vivid colors and good contrast. Cramming a 1920-by-1080-resolution full-HD display into only 13 inches is a neat feat, though in our tests the display sometimes made default text sizes look a bit small and hard to read. Off-axis viewing was above average. Movies and games looked great, especially when powered by the Radeon HD 6650M in the Power Media Dock.

With so much to love about this system, it's a shame that the keyboard and touchpad ergonomics aren't especially good. The keys are on the small side; and though they are spaced apart well, they have very little travel when pressed. The result is a keyboard with poor tactile feedback, which can make extended typing feel a little uncomfortable. The touchpad is smallish, too, and it doesn't have discrete buttons, though the left and right clickable zones along the bottom (separated by a fingerprint reader) are obvious. The touchpad tracks well, but I'd prefer a little more size and buttons that are either physically separate or totally absent--none of this "button zones" business.