Caveat: still the same 5 hours if you use to listen to music
So better if you talk on the phone a lot, the same if you don't.
When you say hands free Siri, does that mean you can activate with 'hey Siri'? And a follow up question: is there a way for iOS to read out new text messages or phone calls incoming and ask you if you'd like to take it?
Messages, yes: "Hey siri, read my unread messages". Phone, I don't know.
You can route call announcements to the headphones but you'll need to interact with the phone in order to decline the call.
I'm also seeing claims of 2x faster connect times. They leapfrogged the other bt headphones I had previously tried with the first airpods, but there are still annoying things about bt I hope they're quietly fixing.