It's great that it gets security updates, but these are updates for a 2015 operating system (Marshmallow). It is extremely sad that I device from 2014 with an $800 introduction price does not get the yearly Android updates beyond 2015.

For comparison, my iPhone 5s (that I recently replaced) from 2013, received iOS 10 and was still butter-smooth [1]. It will most likely also get iOS 11 this year.

tl;dr: you should expect/demand more from a device that almost costs a grand.

[1] I replaced it because I wanted more storage and live photos.