Sony's carbon-fibre VAIO Z is the lightest, most powerful and most versatile ultraportable available. With highlights like an optional Full HD screen and up to a 512GB SSD, and with its optional dock offering dedicated graphics and Blu-ray playback, its rivals don't even come close – especially since battery life is also good. As a package, it has no competitors, though for many users the Z won't justify its extra cost over either its S-series cousin or other rivals like the MacBook Air. However, while it's not without its faults, if you can afford it this is a stunning machine