Most reviews have been glowing, saying its clearly the best small tablet out there. I just got mine. It is awesome size and weight. Display is certainly not retina, but seems better to me than my iPad1. Blacks are darker. Pixel is proportionally smaller. Its ok if I don't try to find them. Unfortunately, with a smaller display I sometimes need to look more closely, then I see... pixels.
But overall. Seems like a great device. I couldn't imagine using something as small as the Nexus 7. Wouldn't seem worth it.
So you can't use a tablet with a .9 inch smaller screen because it's "too small."
I guess that means you must use at least a Galaxy S3 or Note 2 because the iphone 5 screen is too small. Afterall, it's .8 inches smaller.