Little feedback on the UI from taking a peek at this.
When I went into settings and adjusted post display style from card to anything else, it wasn't clear to me that this wouldn't apply to the new For You feed, which left me confused and less inclined to use it. I still gave it a try to make sure I wasn't missing anything and to see how much the feed seemed to change with some light interaction, but I think you'd need to use it more than I did to see an effect.
Problem being: display settings not applying to the For You feed means I'm not going to use it much with the default card view.
Second part is that there was some comment display lag as I looked through posts, so if I looked at a post about cats with cat-related comments, those comments would linger and appear for a moment under a different post about possums. It's just long enough to be noticeable, so thought it worth mentioning.