It's ok.
The tab color on some websites (The Verge & Yahoo Finance) is obnoxious. On other sites like Mac Rumors I like it. Conclusion: I don't like the real dark colors in the tab bar. They make looking at the other tabs hard on the eyes.
I like the tab button design. IT's a cleaner look.
I like the compact bar. I don't think the moving search bar bugs so far. Knock on wood. I almost always CMD-L anyways. I always thought the prior address/search bar was a big waste of space and was due to be "adjusted."
Not sure I like how the forward button appears/disappears. It doesn't affect my usability because I almost always swipe left to go forward or use CMD-right arrow and I don't go forward too often anyway. But I have to get used to the concept of buttons on the browser UI coming and going depending on where you are on a website.
Sort of the same with the little down arrow icon(button.) Not only does it seem like they can design a better button than a little down arrow (because the current button doesn't indicate what it does,) but when you click it and click a tab group then that down arrow goes away replaced by the name of the tab group.
Click the Show Sidebar button. There is a lag there where the back button and left most icon take a second or two to move back out of the Sidebar you just opened.
More than 8 tabs in the compact bar and you have to CMD-click to close a tab. IT could annoy. But maybe tab groups make this less annoying than it otherwise would be. Maybe they can come up with another solution to the mouse-over the tab to get the 'x' (close) button.
The contrast tab highlight is fine overall. But it doesn't seem to exist however if you select compact/no color. And (at least in one combination of tab layout options,) the site icon/favcon doesn't show in the active tab. Which is a bit strange to me. You do see the website name. Of note is the contrast of the active tab is opposite the contrast of its website color. So on The Verge website with its dark black color, the active tab is lighter black(grey.) On the WSJ website with its white color, the active tab is a darker grey.
In the search bar under the compact bar layout, there is a 3 dot button. Click it and you get the Share/Bookmark menus. Yet the Share button (which includes bookmarks) is still on the compact bar.
Refresh button is invisible until you put your cursor in the address bar which changes location when using the compact bar tab layout. I don't know how I feel about this. I usually CMD-R to refresh and I don't think I will have a problem with the moving bar.
Overall I think some of the design changes feel like a work in progress. Interesting ideas that feel like they haven't quite got to the desired end state. AT the same time, I doubt any of this affects my day to day use much if at all.