Just got mine, and I agree about the box. The initial stage (the part where you have to slide it out) requires a power level of 9000+.... Seriously, you can enter that box in some sort of World's Strongest Man competition. >_<
Anyways, I just spent the last hour setting it up. First I examined all the edges, the glass the micro-usb port, the glass again, the back ..etc.
then set up my account, downloaded all my apps. Then did a dead pixel test. Then tested the navigation.. accelerometer seems to be working good, though I need to confirm later with some games.
No problems so far. Touch wood. Currently charging the bugger. Gonna try out more after a full charge.
First impressions:
It's built quite well. The back is lovely. The voice assistant for UK-English sucks. He's some cocky sounding guy, damn arrogant. Like those Earl's of Buckingham palace or something. The type of personality you definitely want to bash with a hammer in real life. . Change to the US English version for the sexy girl. Much better, although the stupid Americans still cannot spell "tyre" and "colour" correctly >_>
No $25 free credit or Transformers or books (there's no big media widget like in the reviews), which was to be expected, but I don't really care about that.
Oh, yeah, the thing is fast. Jelly Bean itself isn't really that new to me since I already have a Galaxy Nexus, but the apps all open faster on this Nexus 7 thanks to the faster processor, probably. I only had a bit of lag the first time Google+ was synching after the 4.1.1 update.
Don't plan to root it just yet. will see how it runs for a week or two.