I use this unit exclusively for audiobooks while on the treadmill and it works beautifully. It doesn't skip even with the thumping of 4mph incline walking. I have dropped it about 3 times and while the door doesn't close as well as it did, it still works as new so it is pretty tough also. I even find the earbuds, which I hate, work and fit well. I like this Naxa so much that I have bought a second for my sister for Christmas. I can't speak to the radio because I don't use it but it plays both MP3 and CD audiobooks well. I started with batteries which only lasted for half of one book. I bought a universal adapter with a 4.5v setting as well as several connectors for about $12 shipped and now I will never need batteries again. It does not hold your place on a CD but since most books have chapters, I keep track of chapter end and skip to that place when I resume the book. You can't beat the product for the money, just get yourself an adapter and you'll will be happy with the unit. I gave it four stars since I can't rate the musical aspect of it and I do wish that it held your place on the CD.