If you're considering getting the iOS 18 public beta, keep in mind that all first-party apps have been updated with advertised beta features, and everything is stable for the most part . . . except for the Photos app. It crashes frequently, enough that I submitted a complaint about it. The app isn't unusable, but I can attest that it crashes at random and inconvenient times.

And the system hasn't recieved power optimizations yet, so expect added battery strain if you do.