Subheading:
Still no fecking email client
Honestly, "themes"? So you pulled the colour variables out of the hard coding and read them from an XML instead.
New gestures? So you added some to the existing list of dozens of gestures.
Linux catch-up? Well, I should think so too.
"the emphasis is on neglected power users"
No it's not. It's a Chrome clone like all the others with a handful of obvious configuration options and nowhere near approaching the flexibility, or features, of Opera 12 released MANY YEARS AGO.
Hell, I still can't get bookmarks to drag into a bookmark folder on the bookmark bar first time. There is literally about 10 pixels of tolerance between "throw it on the bar NEXT to the folder" or "Throw it in the folder" and the folders don't expand so you can't put it where you need to in a sub-sub-sub folder without moving it four times.
This is the sort of stuff that Opera actually FIXED. This is the kind of thing that Opera did by default for everything they do (put any bar, menu, button or object anywhere you like). The actual Opera power-user features just aren't present AT ALL (email client, integrated search, even integrated Bittorrent downloads (years ahead of its time).
I still can't get Vivaldi to actually give me a blank page for a new tab. I really don't want ANY of that junk on there and the barest I can get it down to is two huge +'s, Bookmarks and History. Opera 12? Guess what? New blank tab = a damn blank tab.
But email is the one thing really driving me mad. Opera 12 is now causing me hassle on Facebook and other sites and if I move from it, I won't maintain it as a separate email client. If I'm moving it'll be to something else entirely, most likely Chrome (heck, Vivaldi IS Chrome, so why not just use Chrome proper) and some kind of more modern email client. If Vivaldi don't pull their finger out with even just an alpha "this will eat your email" preview, I can't see me bothering to use it ever again.
And, yes, in work Vivaldi is my default browser. At home, Opera 12 is my default browser and email client, with Chrome for the things that moan or if I want to ChromeCast. So I am testing it extensively - as I have since the first beta release - but there's just nothing compelling to actually make me go "Oooh..." as Opera did and made me pay for it back in the day.