EXPANDING HORIZONS: Opera 10

I have been a Mozilla Firefox user for a long time. It's fast, easy to use, and has a wide selection of add-ons.
When Chrome came out, I tried it out. Yes, it was fast, but I found myself going back to Firefox. And now, I'm prepared to make a change again.

Opera is the only browser I haven't used before (I've used IE, Safari, Firefox, and Chrome). The recent release of Opera 10 beta 1 got me interested, so I will start using the browser for one month, and post my thoughts about it later.