Gonna finally pull the trigger and get an SE. Don't care about 3D Touch and I prefer the smaller form factor. My 5s has been good, however I feel that iOS 11 will be the last upgrade for the series and I don't think I'll be able to utilize all or some of the features of 11. Plus, the case I have for my 5s will fit the SE and not sure about the future of the SE, which if upgraded, probably won't happen until next year.
Until the subsidies quit, I would normally trade up every 'S' upgrade, as I could get a good price for my old phone. My last upgrade was from 4s to 5s as Apple had a sweet deal on trade-ins. I think those days are gone and will just use the ATT Next plan. I just modified my existing plan as I switched from unlimited to shared as my wife uses very little data on her phone and was able to drop my monthly cost by about $35.