I've been using Aurora for the last few months and have loved the experience. It's stable and I get to early access to great new tools. I highly recommend it for any developer looking to use the latest and greatest.
Also been using Aurora for the past few months and I like it a lot. Better then Firebug on most tasks (not all yet) and less resource heavy and less buggy.
CSS auto completion is really good addition.
Next thing to hope for is improved profiling tools. Still the best profiling tools are in IE. Even IE8 is better than Firebug.
IE11 Memory profiling is really sweet.
Though that CSS auto-complete is sweet as hell.
This is simply invaluable to quickly get to the bottom of layout issues. It's really unfortunate that they haven't built this in yet, Firebug slows down Firefox for me to the point of being unusable (switching tabs takes 5-10 seconds) so I'm stuck having either Safari or Chrome open together with Firefox just for that 1 thing.
I still spend the majority of my time in firebug/chrome/ie8/safari though... but it seems the time will come soon when I will switch.
Edit: It only shows searches as a CSS expression, and it doesn't show the results in the DOM view, only by highlighting individual results on the page (like inspecting that element)
So you can right click on the body or a table and edit the html in the inspector.
