I've been wondering if I should get the Nexus 7 as my main and only development device. I imagine it could be great to test both mobile and tablet layouts on the same device.
It could prove very good for that. If you root the device it's possible to run apps (from Google Play) allowing you to modify the reported screen density, which you should be using to alter the layout of your apps.
Given the screen res, price and capability if you're going to have one dev device it looks like the one to get.
Given the screen res, price and capability if you're going to have one dev device it looks like the one to get.