Coming from an IPHONE 11 PM TO 15 PM. As I don’t notice a lot of change except the big obvious ones like straight edges. Smaller bezels, and the dynamic island. I replay appreciate the 120hz. It just feel smoother, and more “pro”. I think it’s awesome and I love it. But a bit overkill for my needs.

I also upgraded to 15 pro max from 11 pro max. Huge contrast! Don’t think you gotta let the battery run out. On the other hand though, you shouldn’t let it sit and charge for very long. I’ve heard letting it sit and charge while at 100% can shorten the battery’s life.