I am using yuyureka from like past 5 months.The phone is pretty good except for sometime it lags.Its camera is excellent and the overall built with the corning gorilla glass 3 which is tough enough. The Cyanogen mode makes the phone even better !
One of the major problem is that the phone heats up very badly! Ams the battery life is quite OK! The phone is smooth and handy to use .The phone is upgradable ato Cyanogen 12.1 which is very cooln I would advice people to buy this phone ! Lets hope it works good even in the future!