I have a 6s Plus, and if I go with another iPhone this time around, it'll most likely be an 8 Plus. I've gone and looked at them multiple times at Apple, and I think they're a nice upgrade. I like the not-really-a-button Touch ID, not to mention I want to keep Touch ID, and I would really like the dual lens camera because I take a lot of low light pics. Plus, ever since I tried Portrait Mode on my sister's 7 Plus, I've wanted it on my own phone.
I was talking to the sales rep at Apple today about Facial ID, and I'm not sure a lot of people realize how annoying it might be. I've had face recognition on a previous Android device, and I didn't use it much. It's cool looking, but think of the following: how many times have you been walking down the hall or down the street and you wanted to open your phone to do something? That's a really simple gesture with Touch ID. However, with facial recognition, walking down the street and unlocking your phone becomes awkward. Unless you stop walking to unlock, you have to keep walking and awkwardly hold your phone up to see your face in order to unlock. That's really annoying. You don't have to bother with walking and holding your phone up to your face at the same time in order to unlock with Touch ID.