The user interface on the Sony Walkman NWZ-X1051 responds quickly to the touch. That's important in a product such as this since the smaller the device, the more quickly users expect it to respond. Sony got it right by making the UI so fluid.
But it's too bad the home screen (3) is so bland --Sony could have made it much more engaging. As it is, the home screen doesn't encourage you to play with the product. And, overall, the menu screens feel a little disjointed, as if different people designed different components of the system. That suggests the device was pushed to market as quickly as possible.