I was a long time Opera user. I
loved that browser. Everything is at your fingertips. You may spend half your day in your browser, so having everything one click away is great. And if it's not one click away, you can make it so. And if you don't like they way HN looks and behaves, you can change all of that easily (once you know how to). Heck, I even worked at Opera for five years because I loved it so much.
In the end, though, compatibilty issues led me to another browser. I miss much of the functionality, but browser support trumps that.
Opera is to browsers what vim is to text editors. Great if you know how to use it properly, but horrible in some very real and recurring situations.