I came across to Windows Phone this Summer after accidentally dropping and smashing my Nexus 4. Picked up a new cheap Lumia 630 for under ?100 sim free. Absolutely love the experience, even though the device has 512mb RAM it's super snappy with zero lag compared to my KitKat Nexus which was a big surprise. So yes, the 635/630 is the ideal cheap way to test Windows Phone. Love singing Cortana, The Keyboard, Lumia photo apps including Auto Selfie using the App/Main Camera, Offline Maps load 5 times faster than Google Maps, Tiles and the design of the phone. Now I'm looking to go up to maybe the 830 or the next flagship if it leaks this side of Christmas.