Sorry for the late reply. I have found it very good. The first build or two rebooted a couple of times a day but the recent builds are rock solid. I've stopped updating it now regularly but when I do the builds just work. I normally stop by the fairphone forums before I stick a new build on just to see if there's any chatter.

I much prefer lineage to any other android experience I've ever had fwiw. Everything just works (except I haven't figured out how to nor really care to spend much time investigating snapchat with lineage).