So far, I find the interface much cleaner and easier to read, at least on my laptop, have not tested on my iPhone X yet.
I like the additional reaction options, though I miss the accumulated XP from the older system. Being able to level-up and earn 1e-like titles was a fun bit of flavor.
Pages load a lot faster and everything seems more responsive, especially when liking a post.
Not having to wait after liking a post before you are able to like another post. But I have been running into an issue where if a like a post soon after liking a prior post, I'm unable to select from the pop-up categories of like for the subsequent post. A generic like will register but not a love, laugh, etc.
Search is cleaner, easier to use, and MUCH faster.
So far I've not come across any functionality that I miss and overall the site is much more pleasant to read, navigate, and search. Overall a big improvement. Just miss the old XP and titles.