This is pretty interesting!  Spotify is not very happy that iOS customers have to pay an additional $3 for a premium subscription when it is purchased through the App Store.  I myself started to upload all of my music to iTunes Match and at the same time, played around with Spotify.  As I was going through my music, I noticed that most of the stuff I was about to upload to iTunes Match, could be found on Spotify so I pretty much gave up on iTunes Match.  Oh and being a student, you only pay $4.99ish a month.  Cannot be beat!

Check out the rest of this article over at The Verge.  Definitely a good read!