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The downside is that some apps have not been updated for the ZenBook's relatively high resolution. They either look pixelated, because they were made for a lower resolution (as with the Steam app), or the app window may appear small, with tiny buttons or icons (as with the Origin game launcher).
But this issue should go away as more devices adopt high-resolution screens and developers update their apps. Upgrading to Windows 10 could also help as Microsoft has improved how its new operating system manages high-resolution screens with battery like Dell Vostro 1720 Battery, Dell Vostro 1710 Battery, Dell 312-0740 Battery, Dell 312-0894 Battery, Dell 451-10612 Battery, Dell T117C Battery, Dell T118C Battery, Dell P721C Battery, Dell P726C Battery, Dell CMP3D Battery, Dell Inspiron Mini 1012 Battery. The ZenBook is preloaded with Windows 8.1, and I upgraded it to Windows 10 without fuss.
At 14.9mm thick, the ZenBook is slimmer than the Air (17mm), although it is not as slim as an earlier version of the ZenBook, which measures 12.3mm thick.
That earlier model used an Intel Core M processor, a low-power chip which does not require a cooling fan. The ZenBook reviewed here uses a more capable fifth-generation Intel Core i7 processor. Along with the processor upgrade, the new ZenBook has 8GB of RAM and a 256GB solid-state drive (SSD), up from 4GB RAM and the 128GB SSD of its predecessor.
The improved hardware is reflected in its PCMark 8 Home benchmark score of 2,176. This is comparable with other ultrabooks in the market, such as the Dell XPS 13 (2,204).
Key travel on the ZenBook is good and the keyboard feels spacious, but I wish it had come with backlighting. The touchpad is large, with a smooth surface.
The ZenBook has a micro-HDMI slot, which requires an adapter and is therefore not as convenient as a full-size HDMI. There is no Ethernet port, though Asus has included a USB-to-Ethernet cable.
Battery life was excellent, lasting 7hr 6min while playing a video. This is about 30 minutes longer than on the Dell XPS 13. But I expect the MacBook Air to outlast the ZenBook, given that the 2013 MacBook Air clocked nine hours.