I switched over and there's a few things I miss:

• Profiles: Containers works okay for me but every once in a while it'll just completely kill a website and then I have to open it in a different window. I know Firefox also has actual profiles which I need to try out but it's also annoying how those don't sync (I think?)
• Offline Google Docs Editing: Huge deal breaker for anyone without consistent internet. Only works on chromium based browsers. Yeah I can kind of work around it but I wouldn't expect many people to want to go out of their way for this.

What I love:

• ublock origin for Android. I wouldn't switch back without it. I can watch videos on YouTube without ads, and there's no ads anywhere else either. Absolute game changer.