I only tried it out briefly, but it was brief because I instantly ran into something that was very jarring and uncomfortable.
I don't know if it's just me (I'm using Firefox to browse the web for clarity) but scrolling while using the Beta layout was laggy. Like... genuinely laggy, it felt like I was scrolling at 1 FPS. The moment I switched back to Classic it was smooth and fine as normal. I'm not sure what would cause that, but I figured it was worth reporting for feedback purposes (and the feedback form link also isn't working.)
