Yu Yureka looks very impressive as far as its specifications are concerned. But the reality is totally different. The phone works good only for a few months. I had to ask for a battery replacement within 2 months of purchase, and the replaced battery was no good. The promise of providing monthly OTA updates is not fulfilled. Currently the situation is that the phone takes around 3 hours to charge fully and also gets discharged fully in 3 - 3.5 hours. It heats a lot even during normal browsing.
It has a very serious bug in its Lollipop OS, which is Memory Leak bug. Due to this it is impossible to do multitasking now. Their deal with Cyanogen has also ended. So now no more CyanogenOS. That is why Marshmallow update is also not being provided.
Now it has become impossible to use this phone with the current software.