Just downloaded today.
Great so far. Firefox was okay, but I was really annoyed by the feature that moves pages backwards and forwards based on the mouse wheel. I was browsing back all the time by accident. And apparently you can't turn that off. The features of Vivaldi seem nice enough to keep it even if that wasn't an issue on Firefox. Is there any way that we can get this onto the Linux mint software center?
If you install the .deb package, it should also add the Vivaldi repository. I'm skeptical about Linux Mint ever adding Vivaldi to their repository, and a third party repository would be basically duplicating the official Vivaldi one (unless it for some reason does not work without some fixes).