I’ve been on the beta on and off but it’s not my daily driver because of a few app incompatibilities.
It’s felt like the most stable iOS (public) beta, ever.
On my 7 128, it feels very much like iOS 11.5 but that’s no bad thing at all (and then some).
It’s worth it just for the speed increases and the general feel of bug fixing and polishing.
Having said that...
Disappointed by screen time, which doesn’t feel quite finished and very complicated to use.
In the end, I’d rather that Apple move to a ‘tick/tock’ schedule and always prioritise speed and stability over new features.
Having a phone that just works, feels fast and is rock solid stable are the most important features of them all.