I got one of these for my NWZ-S series Walkman and it fits the bill very well. Good quality materials are well put together to make this case. It has a handy metal loop on the back which can be used to attach it to your belt with a karibina or similar. When worn like this, the earphone socket is at the top so you are not stressing the cable and it's very easy to tilt the player up to read what's on the screen. The outside is well padded and feels good and durable. The inside is reinforced where it needs to be to protect the Walkman screen and buttons. The outline of the main control buttons are embossed in the leather which makes controlling the player very easy when it's in the case. It can be easily connected to the USB socket whilst in the case too.
I have only two slight criticisms: 1) The magnets which old the flap down ought to be slightly stronger (maybe, it's rather too easy for the flap to fall open when I wear it on my belt and 2) the Walkman slides out of the case rather too easily for my liking. I cured this on mine by placing a small piece of polyurethane tape inside the case and another on the back of the player. Where the two pieces touch they grip and hold the player in place without being permanent, so I can still remove the player if I need to. (Easy if you have access to PU or other rubbery grippy tape. Not so easy if you don't!).
It is a great case especially if you like to hang the player from a belt rather than put it in a pocket.