When hunting for a new mobile phone, being biased by flood of android based phones in market, in beginning I was bit skeptical about Windows OS. But its just a matter of a couple of days of hands on it, I found it is better than my existing android phone. No hangs, no delays, utter smooth operation.
People said that there are few apps for Windows, I found that there are lot of options for normal users. May be for app freaks, they may be less!
For someone who is addicted to social media apps like facebook, this is the best phone. Facebook is deeply integrated in the OS.
Touch is near perfect. Performance is superb which I judged by playing Asphalt 5 game on the device, it runs as charm with full details on! I liked the "Kid's Corner" feature, very useful when you have kids around.
Build quality is very good, form factor and screen size are optimum. Feels good to hold in hands. Offline maps feature is decent however you may not find it as informative as google maps.
Some features may be lacking (like easy interface for enabling, data networks, WiFi, Bluetooth and Airplane mode), but then there is widget for that. It would be better if this widget comes pre-installed in the OS.
Sound is quite good. Creating and managing playlists is a pain. I am unable to figure out a clean way of doing it yet. But once done that should not bother any user regularly.
Call quality, voice clarity etc are very good.
Overall a very good phone in this price range. Of course quite a good bargain when bought from Amazon as compared to other online stores as well as retailers.