Some disgruntled users and ex users. I have used opera for a long time now.The feature sets are what I like and use. If you know how to use it. It should work well for you. I am using both the beta and stable versions in 4 machines. Win 7, Win8.1, Linux Mint 17.1. What I like the most is I can pretty much replicate everything instantly in another machine.
I am running into a problem with Windows 10 preview where Korean fonts are not displaying properly.