/ Sorry for my English, I'm not used to communicate with English.
/ I use Samsung SM-T800. (10.5", 2560x1600 resolution)
Opera Browser for Android is the fastest web browser I've used. But there are minor uncomfortable parts.
####It would be better tab bar at the top to be thinner(tablet).
Opera browsers have thicker tab bars compared to other browsers. Chrome, firefox, Dolphin... I can use Phone UI, but it is better to have tabs on the top.
And, support full screen mode would be great too.
####Put out user agent button from 'Settings'.
Desktop view option in 'Settings' is uncomfortable.
####Add-Ons support.
There are many browsers support Add-Ons like AdBlock, Translater..., etc. But Opera does not. It is main reason that I cannot entirely rely on Opera browsers.