There are several things in particular that you should be looking for when doing these reviews, however.
First, you should compare battery life of each of the different units. Battery life is very important, as this is one of the ongoing costs of owning an mp3 player. Over time, a player with short battery life will cost you are great deal of money and give you hassles that could easily be avoided.
Once you have established the battery life of the unit, you should take the time to compare the storage capacities of each device. The more storage capacity, the more songs you can have on your system without having to change out songs or revisit your computer to improve your library. This should be one of your primary considerations when selecting a portable MP3 player.
Finally, you will need to evaluate how well each product works in comparison with the next.
This will let you pick the mp3 player with the best functionality without having to worry about it in the store. Functions that you should always be in control of include quality of sound, random playback functionality, ease of locating and surfing through your play list, as well as the display.
In addition to this, you should be aware of the format types that can be played on your player, as well as what is required to get your music from your computer onto the player. As some players require special compression that only works with the player, you need to know how easy it is to set up the software, and whether or not your computer is compatible with said software.
By using reviews of recommended players, you will be able to determine exactly whether or not the player has everything that you need in order to play the songs you want, wherever and whenever you want.