No doubt about it but I decided the lighter retina mini is going to be a better fit for me so returned my Air today. I never once considered a mini so coming to this conclusion has me a bit gobsmacked.
I spent about 30 minutes playing with a mini today, testing out its readability since I'll be using it as an e-reader too. I thought the text would be too small without zooming but even after surfing the web, looking at email and messages, I found it was not a problem. Same with viewing photos and video since one of my hobbies is photography. I really thought the smaller screen would bother me, but it did not.
I think it comes down to each person's plan for usage & what works best for them. For me, when I want a bigger screen, I'll use my MBP. But for lightness & portability and discovering I can read the smaller screen just fine, the retina mini will be a better fit for my needs. I also like that it's somewhere in the middle size-wise to my MBP and iPhone 5, affording me a mid-size option for usage.