When buying a mp4 on ebay, there are many things that you need to keep in mind. The mp4 that you see for 50 dollars would be a good deal, but there are some problems. The jack size is 2.5, so when your headphones break, like mine did in 5 days or so, you will have to buy a bulky converter jack so you can listen to it. Also, the jack is on the side of the player, not on the end of the player lie on the ipod. It uses a different kind of charger, so if you lose yours, then there is nothing you can do about it. The built in radio is nice to have andit works pretty good for the most part. You can also record things onto it which also works pretty good also. Other problems include customer support which isnt good, and if something breaks on it the first day you use it, then you are out of luck. The video quality really isnt good, and thats if you can even convert it so it will work on the mp4. If you dont want to pony out the cash for an ipod or zen, then you can buy on of these, but make sure you do your research to get the best one you can get. I would not really reccommend buying one if it is your first music player.