For some reason it screwed up for me, basically set itself up with default settings. I had to erase all content and settings and start over (but don't have to update the iOS this time around).
However, before I did that, I did download a game from the App Store from my 6S Plus that I wanted to try out. It transferred to my new phone and when I opened it up, it wouldn't let me out of the app, no matter what I did! It eventually went away, but during that time my phone got pretty hot. I'm not too concerned about that since my iPhones in the past have gotten hot before but didn't do any damage. So far there hasn't been any hissing noises, but it's still too early to tell! I don't even want to take the plastic wrapping off of the phone! I lifted the part over the "home" button so I could set up my Touch ID, but other than that, the wrap will stay on for tonight. Haha...
As of right now, it says I have less than a 36-minute wait for my iCloud to restore everything.
The JB is a slippery little thing though, as I recall someone else mentioning in here!
I wanted to use my old clear case from my 6 Plus, but the camera cut out would only expose the lenses and cover the flash. Still considering getting a different case than the one I am using on my 6S Plus (which I am using right now as I type this).