I was very impressed with the functionality of Raring with LXDE on the Nexus 7 --- I was able to run the same applications as on my laptop but with significantly better battery life.
I did some experimenting with Unity on an ongoing basis, but spent most of my time using LXDE (where I managed to achieve stable operation). The only major problem was space - although the Nexus 7 I have is a 32 GB version, the only installation image I could find was for an 8 GB install, leaving only a few hundred MB for development.
This storage capacity is not quite enough for me to work with and as a result, the Nexus 7 is gathering dust until I can find a larger image. If a 32 GB image were available again then there might end up being a large number of users out there and I would be one of them.
When might we expect a 32 GB image of Ubuntu for the Nexus 7?
Thanks for the great work! - Chris