My iPhone 6s, with its weird turning off and on randomly at times and other funky behaviors, was (and will always be) my favorite phone I ever owned! I'm not joking :)
Same, still have mine since release. My only issue is the battery but that's cheaply replaced. I'm still deciding if i should upgrade or try to push another year or two with it.
When my 6 broke, I decided to switch carriers (from prepaid) to try out the new (at the time - earlier this year) XR. For the 1 week I owned it, there was something strange about it that I just can't describe. It wasn't buyers remorse, but it just felt wrong in my hands. I genuinely asked myself if spending 1k + 100/mo was worth it. Ended up returning the phone, returned back to my old carrier, and ended up going with a 6s making my purchase at 250 + 30/mo. No qualms.