So I've had mine for a week now.
Not sure I find it worth the upgrade on the original really, I am a tad disappointed to be fair.
Lets get the good stuff out the way, no doubt it is built better, and no doubt the screen is better, but then the screen on the old one wasn't that bad anyway.
However, it still seems prone to weirdness quite frequently. It can slow down quite alarmingly, and yet again, typing put in random characters or spaces, or just doesn't even register the touch, and speaking of touch the touch response can be very poor at times.
Sometimes it seems excellent, then a few minutes later just spazzes out. Just like the previous two Nexus 7 Mk1s I had in that respect.
I don't actually think its the tablet, its Android on a tablet, it still just isn't quite there yet for me. One review I read online actually even touched upon this, saying it was a brilliant tablet, but it just makes the bugs in Android all the more obvious.
I still turn to my chromebook more often, its just a more pleasant device to use for browsing, which is most of what I do. The tablet has its uses, but I'm just not sure about it. It STILL isn't as quick as the Nexus 4 (well it might be faster in a benchmark but I wouldn't know) in day to day use. If my Nexus 4 had much better battery life, I'm not sure I'd bother with the tablet.