I bought my daughter one of these. What a great phone. Shame about the 512mb ram though. 4G / LTE and half a gig ram????? Anyways, it started out green, which proved to be an issue with cases etc. Bought a genuine black shell on ebay, cases not a problem anymore. Also bought a tempered screen protector. This phone is spot on. She loves it to bits, and she has always had android before!! She loves MixRadio and is constantly signing away to the latest 'chunes'!
The 635 is a cracking little phone. Just big enough to be unobtrusive, but not small enough to be awkward. I have had a play with it, and it has a couple of features that my 930 doesn't, which I would have liked. Haptic on the keyboard is the biggest omission for me on the 930, and secondly, the sd card. The 635 also allows for battery swaps, yet a flagship model doesn't!! Very strange. Still, she loves it and it is very rare for her to be seen without it!!
PS, she is eight and found her way around it quicker than me!! That's another bonus with windows phones, she would have to do something completely stupid to mess with the operating system, unlike the 'robot' OS. Very pleased. Now the wife wants one!!