Oneplus one is a good phone if you want to buy it. as I just prefrred oneplus 2 over it because of some extra features but if your budget is low then you can also buy oneplus one.
oneplus one is having 3Gb of RAM having two variations in ROMs 16/64GB both are having duff price as well as colour. the 16 GB varient come with the silk white colour whereas 64GB varient is come with sandstone black .
3GB of ram will speed up your work speed and processing, very smooth touch.
having brillient camera quality, its low light capture is also very good.!