I did the update a few days ago, and overall, I'm very pleased. The main changes I've noted are that I can delete a lot of the pre-loaded apps I never use, camera is activated by one swipe, BUT I cannot reply to texts without unlocking the phone--that is a security plus, I suppose; texts can't be trolled. AND! The navigation function is much simpler to use.
One change I'm still getting used to is having to use the home button to bring up the security screen to unlock, rather than a simple finger sweep, but that's not a big deal.
How does the update work for you other iPhone users?