i'm on a 6s as well. every year i look at the new phones and i just can't justify paying so much for incremental improvements.
faceID is nice but touchID is just fine. 2GB of memory is fine too. and while i don't use the headphone jack much any more, it's nice as a backup for when i forget the airpods. i may upgrade next year with the purported 5G rollout, but i'm not even sure that's worth it. LTE is fast enough and its coverage is mostly good enough too.
When LTE came out in India, I noticed my service provider (Airtel) deliberately slowing down HSPA+.
Plus, I am pretty confident that the speeds that I actually get didn't change by a huge factor when the transition happened. If anything they got slower because of congestion, due to the amazing price drop and crazy increase in user adoption.
For the longest time I thought the iPhone SE was the best phone they've ever made. I might finally upgrade to a model that has NFC and a screen that doesn't stop working in the rain, though.
It's rumored that next year's phone in the iPhone X slot will be shrinking down to 5.4". Not quite as small as the SE's 4.9", but a definite step in the right direction.
faceID is nice but touchID is just fine. 2GB of memory is fine too. and while i don't use the headphone jack much any more, it's nice as a backup for when i forget the airpods. i may upgrade next year with the purported 5G rollout, but i'm not even sure that's worth it. LTE is fast enough and its coverage is mostly good enough too.