Somebody please make a comparison for both models and tell me what are the major differences between them? specially in physical, front & rear sides, How's the speaker quality of second generation, is it louder? The brightness, I heard second is more brighter is this true? Also weight looks like the second is a bit lighter. Battery!? From what i saw at some tech sites, it is bigger which means longer time of using? 512 GB is a big win for me so far. (Owned a 256 GB currently) Might be upgraded to the second generation and all your replies would be completed my final decision. So my purchase, totally, depends on you.