My vote has been 'No', not because I think the update is terrible, so to speak, but because it's rather mediocre.
I have a 6+. iOS10 has made it a lot faster, and more fluid in general, which I have to say is very nice. I half expected it to slow the phone down a little bit. However the negative points kind of get to me and keep me from actually enjoy using the phone. Some of them are:
1. The notifications. Why oh why are they all individually presented and take up so much space. It got me thinking of using my android phone back in the day and how much better that was in this department.
2. The control centre (or whatever the menu is called) which comes up when you swipe down to up. It doesn't make sense to me why they'd have the music controls on a separate card. It's a pain to use now when I'm on the treadmill.
3. No one in India (where I'm from) uses iMessage. Pretty much everyone's on whatsapp, so I almost never use it. Even so, when I do want to send a message, the whole interface has gotten a little too "busy", with links for selecting photos, making gestures etc. I understand this is more of an individual preference, but it doesn't work for me.
4. Apple Music isn't at all intuitive and becomes a pain to use at times. I can't imagine that someone at Apple didn't think it'd be a good idea to change this.
and my last gripe (and possibly the silliest one),
5. Changing the keyboard click sounds and the sound that comes up when you lock the phone was kind of a disappointment for me. I had considered them to be iconic almost in a way. Now it's like any of the hundreds of Android phones out there.