Mp3 Players: a poll

I’m collecting some info about “what is the best mp3 player for running”. Obviously different persons have different priorities, so here is a poll, I hope to collect a few opinion, in order to assign a weight to every of the most important parameters an mp3 player for running must have!
I report this poll also into the original post, about “the best mp3 player for running”.
This poll should allow me to write down a sort of list of best mp3 player on the marked, obviously, to make your run a better experience.