I've been running Aurora for a few months. It's been stable and gets the new toys quicker. Some add-ons break on some updates, but the few web dev. add-ons I use are always quick to update. I get questionnaires from time to time, but they don't take long to complete and are a trivial way to contribute to Mozilla. In short, give Aurora a try. It works as my full-time browser.
I've been running Aurora for six months without any major problems. The only annoyance was some Add-ons were disabled, but Mozilla's Add-on Compatibility Reporter Add-on allows you to force-enable older Add-ons. That said, I think this Aurora release cycle will automatically opt-in all Add-ons.
