The nexus 7 is very nice; light, snappy, feels good in your hand. Jelly bean is much better than any other version of android. But it is no iPad 3. I have several important apps that won't work on it. I'm pissed about that. There have been some screen problems and some problems with the touch screen (one has to do with the screen not being attached properly and the other has to do with the touch screen misbehaving once the device gets hot - like when playing a game). The screen is nice, but again, it is no iPad 3.
If you don't have any android apps already it maybe a good choice for you, but there are lots if things you can't do on the 7 inch screen. Depending on what you intended to use it for, this may not be much of a limitation.
Im still happy with mine. If I can get those apps working, I can be happy with this thing for my android fix.