It has some features that are fairly unique and I appreciate their experimentation. For example, Unite makes it very easy for your average person to share music, files, a streaming webcam, or whatever from within their browser. It's a great way to do something like let a friend listen to a cool album you just discovered without either of you ever leaving the browser. I still prefer Chrome on the desktop but I respect the developers and what they're trying to do.

On the other hand, I do use Opera on my phone. I find tab switching to be much more natural than it is with the default Android browser and I also appreciate the option of proxying traffic through their servers where it is compressed and stripped down to a mobile format. It cuts down on bandwidth and cpu usage which I like, particularly if the data connection is being spotty.