not open source and terrible support
Open source? I wish.... so someone could fix the dozens of bugs they don't care to fix. They keep bloating their mobile browser so that they have something to announce each year in Barcelona and some other places where they try to entice phone OEMs and network operators.
But if you try something and it doesn't work you are better off just installing the whole thing because there is no chance in heaven that they will correct it.
If you go to the Opera website forums you will see what I mean. Apart from a couple of mindless trolls who try to defend Opera without any sensible reason, the forums are an endless list of unanswered cries....