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Not a well built "Shockproof" case, just a really chep Chinese made plastic enclosure with no screen protection. If this is your only option; it's definately better than nothing, but try and find something better.
After getting a Sony NW-A55 and having it take the first 3-ft drop to the tile floor, I decided some protection was in order. This is an excellent skin. It fits very well, and the button extensions it provides work really well. No problems plugging in the USB cable or the audio jack.
Update: I accidentally left my NW-55 with this Fat Bear skin on the hood of my car. Saw if fly off the frontage road at 55 mph, and in the rear view mirror, I saw it tumble on the road quite violently. I got back to the spot on the road and recovered my gear. Wow--the skin took a bit of a beating, and the NW-55 looks and works like new--not even a scratch the screen! The buttons on the skin work like new. Doesn't get any better protection than this!
This case fits very well, installation was easy. Others have commented that the buttons are difficult to press. I found them to be the same as on most cell phone coves of similar thickness. Have no issues operating the buttons. Purchased this to protect the player while bouncing around in a fairing compartment on a motorcycle. It is thick and offers great protection from bumps and drops.