So far so good. No real noticeable difference in performance. Battery life TBD, but typically by this time it's in the 85% range. It's at 91% as of this writing.
Update: RCS appears to be broken and Messages has become wonky. When I check the status of RCS it says it is not available on my device. I am also noticing it is not showing the contacts images for those that have one set. The app would also crash when trying to make an audio or video call with a contact during a chat. This usually launches Meet.
I appear to have corrected this by clearing the data from Messages and Meet and rebooted the phone. RCS is still not working.
... Just noticed that profile images are not showing up here as well. Hmmm
... And now RCS has turned back on. Though the contact images are still MIA.
I'm noticing a little improvement in battery life, no problem with RCS, messaging. So far, so good. Probably going to upgrade soon, but the pixel 6 I've enjoyed as much as I did my Nexus 6, and I hung on with that phone almost 5 years.