I only have three minor complaints about my newer (and still currently on the market, I think) Sandisk Clip mp3 player:
1. The plastic screen is soft and will scratch if you throw it in your backpack with a bunch of other stuff. It's backlit, so I haven't noticed any difficulty in reading the screen, but it's worth mentioning.
2. The sping-loaded clip will break over time if you throw it in your backpack with a bunch of other stuff. I don't clip it to anything, so when the clip on the back of mine cracked and then finally broke away, I didn't mind. It's even smaller now. I believe it cracked from being in contact with other things in a bag and not from actually using the clip itself.
3. The printing will wear off the buttons over time.
I took them out in the sun to try to show the scratching on the screen of the one in the middle. I recommend wrapping it in a small towel or something if you're going to throw it in a backpack with a bunch of other stuff.
Just for grins, I turned the oldest one on its side to show the wear on both the cloth case and the painted metal around the On/Off button. I used it for many years before my family gave me a newer one for Christmas a couple/few years ago. I'd still be using it if they hadn't, but I admit I prefer 16 GB to 4 GB. I can load a bunch of music and audiobooks and not have to change anything for longer periods of time. The old one has a metal housing and a wheel that spins and pushes in, but the newer two seem to be entirely plastic except for the metal spring under the clip and have push buttons instead of the wheel.