My Nexus 7 tablet has just been upgraded to the latest 5.0 Android flavour. No problems noticed so far but it does seem a little slower. This might be my imagination but it could also need more processing power. Visually it looks a bit different but not strikingly so. The little buttons along the bottom of the screen are different and it seems to turn off with a single click, so to speak. No need for the confirmation the older system wanted.