I wanted to try it since I couldn't understand what the fuss was about, then I saw it's still in closed beta.

What are your impressions of it?

I'm not the person you asked but I love it. It's actually solved my tab hoarding problem and made my life so much simpler. Caveat: I'm an ADHD sufferer so my experience may not be typical.

I actually have ADHD(I) as well, and have been trying to battle tab/bookmark hoarding myself. It seems Vivaldi is working well, but I was wondering what Arc has to offer.

You likely know what I'm talking about, tab pinning is broken in all mainstream browsers, it isn't broken in Arc. In addition, you can pin groups of multiple tabs tilled side by side (not very useful without a wide screen, but still)

It’s highly limited compared to the tiling in Vivaldi. You can only tile 2 tabs at a time. Arc also doesn’t seem to have horizontal tabs so you lose 10-20% of your screen space to the vertical tabs bar which gets annoying. I do like Arc but there are some basic things missing that make it hard to use.

Maybe you tried it a while ago? You can tile unlimited tabs either horizontally or vertically (but not both). I've never found any reason to tile any thing vertically anyway, the web just isn't designed for small horizontal windows.

I use an ultrawide 32" screen and even for window tilling I use PaperWM (technically a Hammerspoon script because PaperWM isn't on MacOS). So I only need to navigate windows/tabs in one dimension (horizontally).

Arc does have the benefits of native UI, Vivaldi at least when I tried a couple of months ago was very janky, presumably because the browser chrome is written in React.

Somewhere in this thread people mentioned Stack browser which is actually closer to PaperWM in terms of how it tiles tabs. For both Arc and Vivaldi it's very annoying if you resize (going fullscreen and back) windows with tiles because the size of the tiles gets messed up. Stack just keeps the size and make them scrollable.