For one thing, Opera 12 was the last version released for Linux. It was also the last version before they basically completely rewrote the software on top of Webkit.
I was a Linux Opera user since 2007 up until a couple months ago. I finally switched away because Opera 12 was getting on three years old, which is ancient for web browsers. Now I use Firefox full time, and I've heard enough bad things about Webkit Opera that I'm not really interested in even trying it.
"Rewrote" isn't even accurate, from what I've seen. On osx it's like a buggy version of chrome, with few of the things that I liked in the original opera browser.
Supposedly they're working on it, and I'll try this on my linux machine later today, but I'm probably staying with chromium everywhere at this point.
I was a Linux Opera user since 2007 up until a couple months ago. I finally switched away because Opera 12 was getting on three years old, which is ancient for web browsers. Now I use Firefox full time, and I've heard enough bad things about Webkit Opera that I'm not really interested in even trying it.