I probably enjoy the new, reworked messages view (with the apps tucked away under a single '+' icon) the most.

There are some bugs (like the screen freaking out for a second when clicking a messaging notification) but nothing too bad. Hopeful that the 2nd beta they just released today will fix some of those issues.

since day 1. smooth as silk!

As said by a few people already, it's been really smooth. IGN 10/10 for a dev beta

Many seem to be using it to get the airpod beta; not seen any updates on the phone beta itself tho

I’ve been enjoying it! I’ve only had to reboot once - but I think that was more related to low storage than anything else.

I skipped the iOS 17 beta so far. First time in ages that I did. With all the new safety features lately, I prefer my main device to be stable over having the latest and greatest. Which is a huge change for me.