OnePlus saves face with the launch of Oxygen OS
Most details are similar to a pure Android version, with a few tweaks here and there concerning gestures activated when the screen is off and some user customization applicable from the Quick Settings menu. OnePlus devices run on CyanogenMod 11S at the moment, and to change to OxygenOS you will have to manually flash the new ROM.
Most OnePlus owners are still upset because the Cyanogen aspect of the device was one of the best-selling points of these devices altogether and now that that is gone many questions still remain. The One is still behind some LG, Samsung, HTC and Motorola devices.