I traded my 7 Plus for an S8+. So far I'm really liking the S8+. It's not perfect by any means, but no phone is. I switch back and forth a good bit b/c I'm on JoD with T-Mo so I can switch every few months. iMessage, Continuity, and my Apple Watch always bring me back to Apple, but as of now I'm satisfied with the S8+
A few thoughts: I'm finally getting used to the FPS location. It's def not as easy as my 7 Plus, but not a huge issue. MMS has gotten better. Videos are still grainy and bad compared to using iMessage, but photos come in much more clear than they did with my Note 7. The overall size of the S8+ is great!!! The display is beautiful and bright.... And I can't believe I'm saying this, but I love this version of TouchWiz (never thought I'd type those words). There's something really nice about the wire frame icons and the navigation buttons. They just look really modern to me. And yes, I already miss my Apple Watch!!!!