Vivaldi's features are great.
But Chromium is garbage. Especially now where Chromium devs have killed GDI rendering which creates blurry fonts. This screws up also rendering on low end graphics chips which results in heavy scrolling glitches if you have your bars in a different location than standard.
Really can not understand the Vivaldi developers that they have not chosen Mozilla's Gecko engine as source base, not that complex to understand like Chromium and even if Mozilla are morons, they are not complete morons like the Chromium developers.
Vivaldi's feature set is really refreshing and a blessing for powe users or advanced users. But as long as they use a crappy source base, Vivaldi is utter crap too.