I ordered one off Swappa and it'll be at my place when I arrive early next week (I'm currently in China working). My phone history is pretty simple...
I went from the Motorola Razr (used it for many years) to the Blackberry Storm2, which I loved (had it 3 years and only gave it up after BB stopped issuing updates for that model).
Then I switched to a free iPhone 4S from Verizon (the 5 had already been out for a while and I had lots of credit) and used that until the iPhone 6. I bought that at its release and loved it (only complaint being how stupidly slippery it was). But when I started working in China I found it difficult to get any 4G coverage. I had zero 3G so just 2G 95% of the time.
Early last year I snagged a used but mint 6S Plus and its perfect in china. All 4G bands from all three Chinese carriers are covered. But despite how amazingly fast the phone is and how user friendly it IS too damned big in a case.
Nice I held a Samsung Galaxy S8 in my hands I was in love. Same physical size as the iPhone 6 and 7, but all screen! Just WOW from here to eternity.
My two fears are the known fragility of the S8's glass front and back (I have personally witnessed two of them breaking over here, one from a fall of around 3 ft) and of course... what will happen to my brain as I switch from iOS to Android. That is going to be a steep learning curve. I had better find a good tutorial online.
By the way, I am holding onto the 6S + just in case. It'll be my backup phone.