I tried Opera a while ago but stopped using it due to it’s lack of a quick links toolbar, not the greatest reason I know but it’s handy!
I was inspired to try it again after reading Ra’s writeup and seeing the Speed Dial feature and I’m impressed.
I havn’t used it enough so far to give a thorough opinion on it but so far: The fonts render better, everything seems quicker, and I like the smooth interface. I’m using the mouse gestures too.
Firefox is great, but it doesn’t help to try alternatives; I’m starting to think I’ll prefer Opera.