I made the jump exactly two weeks ago. Upgraded from an 8+ (my first iPhone). Day 1, I wasn't feeling it too much. Day 3, I forgot to charge my phone before being away from my house for 11-12 hours.
But my phone lasted me ALL that time w/ no charge.
My 8+ never showed me that kind of love.
Been in love ever since!
Not to mention how much smoother things are with the updated hardware. Still playing around w/ some of the other new features and apps. Only thing I really favor with the 8+ is the screen. I notice the difference in resolution and finish. Plus the "full screen" experience is nothing more than zooming in as far as YouTube and Netflix are concerned, which I don't care for. So I also lost some screen dimension when watching stuff on my phone. My son thinks the camera is better than the 8+. I haven't taken any serious pics, yet, to really be able to speak on the rear camera. The selfies are better, tho.