If audio quality is not important to you this will work just fine. If audio quality is important to you then I would steer away from this unit.
general rule of thumb is 1MB per minute for an MP3. Average song being about 3 you can estimate that most songs will be about that. I haven't looked into more current formats but I assume compression has improved while maintaining higher sound quality. I think back when I had an pop nano 4gig they mentioned putting 1,000 songs on it. Which for most is more than enough space...Hiw much data is a song? Idea is to play music on iPad when far beyond cell or data range. When in range, no brainer, pandora blasts thru the jeeps bluetooth speakers.
I love my Spotify also! I have all of my music downloaded and will be able to play it in airplane mode for the next 5 days off grid!I like my Spotify a lot, and they make it easy to download a playlist or set of albums for offline listening. $10 a month and I can use it on damn near every device I own (one device at a time, though I can turn other devices to airplane mode and still play the download stuff on there as well as a live device).