I've been using Opera almost 15 years, since I bought it on a floppy disk. I love the 1-key shortcuts, small screen option, panel & bookmarks setup, look & feel. But web page compatibility was terrible. But I still love it for the sites that it works on.
So I'm keeping my 12.17 but just installed New Opera 24, hoping it can replace my IE. So far I'm impressed with the speed and look & feel. Time will tell.