thanks to the developers I don't have any real problems with spotify. Neither on my Mac nor on my iPhone. So here comes my minor one, but I bet most of us are gonna be on my side on that one:
I'd like to have a better looking icon for the iOS app!! Please, I know you can't screw around with your corporate identity stuff all along, but since I'm not able to change the icon on my own (on my Mac I found a nice alternative on this deviantart-site) I'm begging you to redesign this strange green thing ;).