[karmelapple]

Highly disagree. My 4S and 5S were both fantastic for at least two major OS cycles.

[problems]

Yeah, you get about the same with the Nexus devices, at least I've got friends still running the N5 who've went from 4->5->6 without issue. I've done about the same on my OnePlus One (5 was out when I got it but it shipped with 4) so it's not unheard of on the Android side at least.

[throwanem]

Same here. It took four major versions (5 -> 9) for my 4S to become too slow to use.