I love my 11" Air. I've barely used my iPad since getting it. It's so light and takes up so little space in my bag that I barely notice it's there. I use it far more than I used my 13" Pro.
The screen is just about good enough, but I'd like a higher resolution to give me a little bit more space- without increasing the physical size, though. I have also discovered, to my surprise, that I need more RAM - which is an issue with all Airs, since it can't be changed. I'll have to make my spreadsheets more efficient - 105,000 rows is a bit much. :roll eyes:
The battery life could also be improved - I get maybe 4 hours, which a couple of years ago I'd have thought was amazing, but it just isn't enough now. It means I have to carry the pesky power brick around with me!
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Oh, yes, and I'd like better speakers. I usually have an X-Mini II with me anyway, to plug into my iPhone, so it's not too much of an issue.