Not sure why so much negative comments about this ultrabook. It's solid offering and a step in the right direction.
Yes, it has screen resolution that could be higher. But this is portable machine, nobody will do any serious development on 13" screen regardless of the resolution. You would hook it up to a nice external monitor and real keyboard for serious work and have laptop for out of the office work or demos.
It is also cheaper than comparable MacBook Air with 8GB RAM and 256 GB SSD.
In terms of quality, I don't consider Dell a bad choice, pretty much every laptop and desktop machine I purchased over the last 10 years was Dell (Vostro, XPS and Optiplex lines) and never had any issues with any machine.