Hi,This device is very good to be used as a portable device, I use it when I travel to connect to my desktop computer using Teamviewer. The OS is very light and gives you 10 hours of battery life. But I am disappointed with the gmail app which is android phone based which is more focused on touch-based usage. But I hope goolge will develop Chrome OS specific one soon. You can check out the images to see what I mean by it. I have also uploaded the picture of the internals there is noting much you can upgrade or replace.Final word, it can not replace your main computer unless all your work is done on the browser. And when you buy once buy one with the touchscreen. Currently, 32 Gb SSD/HD is enough for chrome OS.