How is it? I'm leery of anything (a) Chromium (b) advertising that heavily, but I'd be interested to know what your experience has been so far. I do know that they've baked in an exemption for uBo such that it won't be nerfed in 6 months when Google kills off the WebExtensions v2 API in Chromium.
It might not be for you, I like it, convenient and supports Chrome extensions in addition to its own. It's pleasing to the eye, offers a decent built-in dark mode (but you can install dark reader too if you want), generally very compatible and snappy. The built-in ad blocker is respectable, but more in the vein of Adblock Plus than uBlock - with the whole "nonintrusive" ads enabled by default, and even if you turn those off too, some still seem to come through, unlike uBO.
However, Opera is very much commercial software. Fortunately, the advertisements in its "Speed Dial" functionality (which is basically shortcuts under new tab), "cashback feature" for partnered shops and the sort can all be disabled in settings and the browser will never bother you with them again. If they did I'd not have stuck with it.
The gaming version (GX) has some gamer-themed tweaks, like Cyberpunk 2077 inspired theme, changes some of the advertisements in speed dial to gaming news and sales on key sites and the sort (which can also be entirely disabled) - adding an option for aggressive resource management, like, you can intentionally limit the amount of RAM and CPU that the browser can consume, although it does make it load things considerably slower if you enable it. So to that end, Opera GX is interesting if you have a low end PC and needs to ensure the browser won't hog all system resources.
It's a viable option in my opinion, it embraced the whole "AI browser" farce without managing to bog down the experience or make the entire thing about it - in fact, even the button to summon Aria (their AI chatbot) can be disabled or tucked away. it's not focused on crypto like Brave or force feeds you the Microsoft ecosystem like Edge, though it has little love for "free and open source" at the same time.
You might be interested to know about Opera Norway AS's affiliation to Beijing Kunlun World Wide Technology Share Co., Ltd., though. I don't really have anything against China, but it's worth keeping in mind. Vivaldi is a solid option, it's from one of the web developers that created the very first Opera browser in the 1990's.
