I have been running various Lollipop ROMs on my One, and they all seem to have problems.
I think most of these are Google issues. I'm now running Lollipop 5.1 stock. on my Nexus 7(2013), and that seems bug free, better in every way.
I've now been running OxygenOS, on my Oneplus One for two days, and I'm having great fun.
I've put on Go Launcher Z, and a very dark theme, and the whole thing is very "phone of the future".
I don't know why people are complaining about how minimal Oxygen is, we have the whole Playstore, plus the whole world of Android apps, XDA Developers etc, to build a phone for ourselves, from.
So whilst Oxygen doesn't feel as "full" as CM12, it can easily be, and it seems pretty smooth, fast, and stable.
At the moment I've gone for an over the top techy eye candy look. I'll stick with that for a bit, and then go beige minimalist, or wispy grey tone. I love this phone
I'm in the UK, and I do have one, pretty important bug. in Oxygen, with BBC iPlayer, and/or BBC Media Player. If I try to watch a programme on catch up, it tries to start, then freezes. This is a complete freeze, and if I have to do a hard shut down, and then reboot.
Is anyone else in the UK getting this problem, with Oxygen?