I've been running Opera since version 2, from 1996. To this day I still move the URL bar to the bottom of the window if I can, because that's where Opera had it until 4 but it was left configurable ever since. I strongly believe Opera 12.16 was one of the best browsers ever made & I still run it on my phone (in Opera Mini guise.) They fell flat on their face when they switched engines & jumped from 12->15 and lost most of the features in the process, but the later versions (29+) have been pretty good.
Am hoping to jump ship to Vivaldi, which is essentially the Old Opera team back together, but the last 'tech preview' version I tried wasn't really stable enough for everyday use. Eagerly waiting for that one to go into late-beta or RC.
I occasionally pop open Konqueror, Firefox or Safari depending on machine if I need a secondary browser, but I don't use them for a whole lot of things.
The only exceptions are my G5 Macs where I use TenFourFox which is a port of Firefox and is basically the only modern thing available.