I am using One plus one from past 1 year and it’s just awesome.
1) great battery backup
2) high resolution quality
3) great dual sound speaker
4) cyanogenmod(lollipop) is perfect
5)great camera quality(HDR Mode option is better)
if you are looking for buy this phone just take it. hence its your choice .
according to me this phone is my bestest phone ever.
from the date of purchase till now there is no problem at all.