Sure, I was lucky to be one of the first people to receive their iPhone 16 Pro so I can comment on it.
All of the actions you can perform with this button (it is a button, Apple) can be done faster and easier with on-screen controls.
Also, there are way too many new actions to learn in order to achieve…exactly what you could achieve before.
If there had been any significant changes to this year’s iPhones and this was just an additional thing, then it would have been fine. But they focused on it a lot during the event and they still promote it as a big thing…and it’s a button. An overengineered, complicated button that achieves nothing new.
A gimmick. A reason to justify a yearly upgrade when we all know it’s not needed.
The only reason, GOOD reason I see to upgrade to this year’s models is battery life (and hopefully no thermal issues like the ones found on iPhone 15 Pro).
On a separate note, the iPhone 16 colors are gorgeous. If they had Promotion I would have bought one of those instead (the teal and aquamarine are beautiful).