From experience (my sister-in-law and a couple of other family members), they have a high return rate. People expect them to behave like a full blown laptop but they don't.
I would be very happy with a 768x1366 10 inch screen. Currently, I use an Acer Aspire One with an 9 inch screen as my main computer. The thing is that, when at my home office, I connect it to a big monitor, a nice mouse and a keyboard.
The only part I dislike is the 600x1024 pixel screen. It's a bit on the small size and lots of programs (and websites) seem to think 768 lines is the minimum.
