I wish it still worked well on modern sites. I used Opera from around 2000 until when they switched to Chromium in 2012ish. The first version I ever used predated the Presto engine. I used it for everything except web development (which I did using Firefox and Firebug) and sites that needed ActiveX (where I had to use IE).
These days I usually use Firefox, except I use Chrome for web development since its dev tools are a bit more responsive on complex sites compared to Firefox’s.