Interesting to see the comments are about the same as 6 months ago. The simple fact is "old" Opera was well designed for mouse and keyboard operation. And one can love the new speed dial but it was easier to access sites via cascading text entries (bookmarks). Of course, if you are using a touch interface switching to the "new" Opera may be a good idea. Won't work for me.
Last autumn it was stated that far more downloads were taking place with the blink version than had been the case with the presto version. Didn't think much about it at the time, but of course there were more; every version 12 user was downloading the new version, testing it deleting it, and doing it again when an updated version came out.
As I said in October, I don't care much about the rendering engine. I care about the interface and the configuration and security tools. The new Opera is lackluster at best in these areas. When I get a touchpad to tote about I'll use the new Opera, if for no other reason than I don't trust anything Google. But not until then.