Asus Zenphone 4,5,6 three are great, specially the asus zenphone 5. I have zenphone 5 and from the last 5months i am using this with some minor problems. At this low price we got g glass3 protection, 2gb ddr3 ram, and ofcourse intel technology but the battery is not so good enogh. Camera quality and headphone sound quality is superb.
I get easily three days battery backup, today after three days i recharged my phone today. Make sure you turn off gps which is turned on by default.
And don't root your phone android Lollipop update will be released soon.