I'm about to make the plunge for R1F until I saw someone mention grainy screens on the laptop. Can someone confirm how serious is this. I heard that most tablets would have some degree of graininess. How does this compare with other models like the Fujitsu T4210 or Toshiba m400? I'll be using the tablet primarily for reading textbooks (at about 30cm away) and watching hours of video lectures. My other concern is the upgradability of the processor. Can anyone who own this laptop confirm that the CPU is upgradable? Thanks!