I was using it on a N5 for a month or two as my daily driver.
I am not a heavy user, but used it for calls, texts, internet (emails and browsing)
Screenshots, podcasts.
I was really enjoying it.
Never had any problems at all with it at all.
Some of the apps are still work in progress, but I had enough apps that work perfectly fine for what I need.
I spend all day in a van though and the BT not working properly is what stops me from using it.
I have picked up a OnePlus 1 as well. Using LineageOS on that until the BT works out.

@advocatux Interesting point.
I was surprised to read people crashing with the N5.
I was using it for a month or two as my daily driver and had no issues whatsoever with anything crashing.
I am no heavy user mind.
I did do a clean install at the time.
Edit: had to use a different phone though as I need the BT.
So picked up a OPO and will progress on to that when BT is sorted.