Toshiba Portégé R400

Most ultraportables have a hefty price tag because miniaturising things (and selling to a smaller audience) doesn't come cheap; but few of them match the price with design that looks as if it ought to cost that much. The R400 looks the part, with the gleaming Toshiba brand inset into the glossy white widescreen lid - although it vanishes once you swivel the lid round into tablet mode. The story is the same for almost everything else about the R400; superb design, but with the odd place where it doesn't quite follow through.

The 12.1" widescreen means plenty of room for the keyboard - this is one of the biggest keyboards you'll find on an ultraportable, with full size keys, a deep wrist rest and a responsive trackpad. The LED backlit screen is bright, clear and vivid and although the anti-scratch coating makes finger marks more visible, you only see them from an angle, not when you're looking at it straight on. It's not an outdoor screen but it's readable in all but the brightest sunlight.

With a 1.2GHz Core Duo rather than Core 2 Duo, performance is fair rather than outstanding; you can happily run Vista Aero, several Office applications and edit large images without feeling the strain but we wouldn't suggest video editing or CAD on the system. All that makes for one of the best ultraportable notebooks on the market- but you also get the full set of Vista tablet features.

The tablet hinge is more robust than on many models, but without leaving a protruding lump in slate mode, with a central swivelling hinge and latches at either side that engage automatically; the screen also rotates automatically. The pen is on the small side but writes smoothly and naturally on screen and Vista's combination of gesture shortcuts and learning from your corrections makes for a more usable tablet experience. The fingerprint sensor is well placed for capturing passwords in notebook mode or logging in to Windows and Web sites without typing in tablet mode; you can also use it to scroll and with the joystick and power buttons you won't need to pull out the pen unless you're writing something.

At 1.7kg the R400 is just about light enough to use like a clipboard, but you'll probably want to add the extended battery. This latches on very securely and takes you up to six hours but adds a rather chunky strip to the back of the unit; good for the typing angle but rather in the way in slate mode. Without the extended battery you'll get three hours of battery life in power saving mode without Wi-Fi or around two hours ten minutes with everything running.

You get Toshiba's usual volume dial and wireless slider, so you always know whether you're turning Wi-Fi off or on. There's a minimal set of ports; two USB, one PC Card plus VGA, Ethernet, speaker and headphone jacks - no FireWire or memory card slots. That's because some of the edge of the unit is a single-line OLED screen for Active Notifications; put in a SIM to use the built-in 3G and you get the same push email from Exchange Server as on a Windows Mobile phone, with new messages and appointments showing up even if the machine is hibernating (it wakes up periodically to receive). You can filter this by work hours or with simple message rules. Without a SIM you still see notifications for incoming email and the screen shows the time and battery status which is handy but given that Toshiba and Microsoft collaborated closely on the system it's disappointing that you can't use it for SideShow gadgets as well.