I rarely give 5-star reviews, but when I like something, I like it, even if it has shortcomings. One of the shortcomings of this device, in my experience, is that they do not mix well with washing machines - OK, my bad. I was pretty disappointed when I couldn't resuscitate my nano after it went into the wash. Eventually, I replaced it with a used nano. I like that I can use my itunes playlists while saving the battery on my phone; and I can use my bluetooth headphones (a ""must have"" feature for me). the form factor is also a selling point for me - these are very slim; just don't forget to take it out of your gym shorts. There are settings to adjust the EQ, but no custom EQ function, if that matters. But I can live the available options.