This is a really good tablet I am using since 2014 to today. Battery is really good. I have also get 2 system updates. From android 4.3 now it is running on android 5.0. And still there is no problem. Also the the tablet is very durable. I have dropped it many times but the screen is very strong, not a single crack in the tablet.Sound quality is very good with the asus sonic master technology. Six types of sound mods are there. Calling quality of the tablet is also very good. From my side the tablet is very good and I am satisfied with it after 3 years of usage.