Been using Vivaldi off and on for the last few weeks. I've finally decided to go with it as my main browser now. Was a long time user of Opera 12.+, and I hope eventually it'll have the builtin email and download manager like 12.+ had. But even if it doesn't, it's still better than Chrome proper, what Firefox is becoming, or Edge.
Welcome to the forum! If we win back all of our O12 users, I'm sure we'd have a lot more users. Not sure what kind of number that would be, but it is a "browser for our friends", meaning the users of O12 and power users in general.
Built-in email client is in the works, and has been for the last 3 years. It's a big project, and will likely come sometime next year.
Download manager(as in the page) will probably come, as it was part of O12, and there's no way they'd want to leave it up to Chromium. For now, there is the downloads panel, which is pretty good. I did make a post for a dedicated downloads page, which you can upvote and bring attention to right here. It has 38 upvotes at the time I'm writing this, which means there's a lot of demand for it.
Hello , Welcome to Vivaldi ... Have a nice time Here ...