Anandtech is calling this a "mini review" as per their usual excellent work the review is not so mini in my opinion.
Here`s the Google Nexus 7 quick take away:
"Honestly I think ASUS and Google have really done an excellent job here with the Nexus 7. The combination of a quad core SoC, IPS panel, solid construction, and the latest version of Android all for such a killer price point pretty much make it hard to really find any faults. Sure, it'd be useful to have a full size USB host port, microSD slot (though no Nexus has shipped with one since Nexus S), 5 GHz WiFi (Nexus 7 is 2.4 GHz only), or cellular, but the tablet wouldn't be $199 anymore. I also really feel like the 7 inch diagonal form factor is an ideal one, and the Nexus 7 is quickly growing on me."
And now on to Android Jelly Bean 4.1:
"There are more changes as well, including binary diff / delta update support for updating marketplace applications. Google has done the usual thing and outlined all of those other changes on their developers page for Jelly Bean. It's impossible to pass judgment on Android 4.1 after just 12 hours with both an updated Galaxy Nexus (with my primary SIM inside) and the Nexus 7, but thus far the improvements to UI smoothness have made a noticeable difference. Beyond that, probably the second most appreciable difference is in notifications, which now conveys much more information for things like new mail beyond the subject line and sender. The other thing to note is that again, this Android 4.1 isn't 100% final, but it is extremely close. I haven't seen any glitchiness yet, but obviously there will be changes before the final mid-July OTA update for Galaxy Nexus devices and others that were announced in the keynote. I'm looking forward to digging up the other subtle things that are new in Android 4.1 and updating if necessary."
Much, much more here