 First displayed in June 2012 at Computex , the Zenbook Touch series has touch screens to take advantage of the Windows 8 operating system . The Zenbook Touch series includes the UX31A which is the same as the Zenbook Prime , but with a touch enabled screen , and the U500VZ , a 15 inch model . A UX21A with a touch enabled screen was also demonstrated at Computex in June and officially announced in late August , though at the launch event on October 23 , 2012 , only the UX31A and the U500VZ were displayed . The U500VZ is thicker than previous Zenbooks at 20 mm ( 0 @.@ 79 " ) and uses a standard Ivy Bridge mobile processor rather than the ultra @-@ low voltage CPUs used in other Zenbooks , thus technically pushing it out of the ultrabook category , although it still meets other ultrabook specifications . AnandTech reviewer Jason <unk> found the touch screen to be so superior to the trackpad that he stopped using the trackpad altogether in his trial of a Zenbook Touch at the Asus launch event . Chris Griffith of The Australian found that the screen of the UX31A responded well and that the Windows 8 gestures worked predictably , his only criticism being the high price . 
