I've had my Asus Zenphone-5 (2gbRom/16gbRam) for a month now and am very satisfied with this phone. I was concerned about battery life but it has been OK under normal use though I usually make a point to top the charge up whenever I can.
I am not a heavy gamer or app user but I have found the interface to be easy to use and the call quality to be good both ways. The camera is decent and the music player works well.
It is light weight enough that is doesn't weigh my pocket down. I like the 5" screen for reading news articles online. The WiFi seems to work well and holds the connection.
3G data loads quickly and the browser is quick and responsive.