I just upgraded from Opera 9.27 to Opera 9.5 today and I am impressed.

It is so fast! Everything is even more responsive than before - and I though it was fast then (vs IE) - you should see the animated GIFs on this site (them smilies)... they do a complete loop in around five times a second.

The only down side(s) is that when I upgraded, previous history entries that I had deleted came back. I think that has got something to do with the new history search feature. Another minus is that the tool bar that shows the tabs looks Vista inspired - not a good thing when you use Linux.