I had bought yureka kn 3rd sale. Since then I am using this. Here is my experience regardig this phone.
Camera- 13 mp rare capture good photo in daylight. But in low light image are not clear.
Processor- 1.5 octa core with 2gb ram makes multitasking unbeatable.
Cynogen- custom rom with cynogen makes u developer. You can do whatever you want to do.
Battery- 2500mah battery is not sufficent for this. It hardly gives you 1 day backup.