Summary: I was looking for a case to protect my Onyx. I'm really happy how the quality is on the case. The ear buds fit my ears great. For a shot in the dark this turned out pretty nice. Just remember this case is better to hold larger mp3 players with a screen.
Pros: The case fit's my Mach Speed Onyx like a glove. The head phones sound nice. The case is nice and will protect my MP3 player. There's a clear plastic that's able to protect the screen but also let's you view the contents of the player.
Cons: Phones have to stay in the retractable holder.