Sony was the pioneer in ultralight laptops way back in the day. Today, they still make a smaller and lighter laptop than a MBA 11". Problem with the units has always been worse battery life than MBAs, torque/flex issues with carbon fiber frames, overheat issues on older processors, Windows and NTFS (it's just too much maintenance for me, nothing really wrong with it except that it's built to break after extended use), and non-CNC manufacturing (which leads to inferior build quality). Sony VAIOs also don't really design for human use which has been evident over the course of time. I wish I could go back to the days when Sony was a contender in laptops/notebooks but Apple seems to build the best consumer computing products now. Oh yeah, almost forgot to mention that Apple products are more convergence friendly now than Sony but it wasn't always that way.