I hardly use Spotify. I just use it if I don't want to buy a whole album or if I want to check out some new band. There is an ad every 3 or 4 songs - this seems pretty reasonable for me. I don't know of any other limitations. As much as I've read most of the limitations are for people on the mobile app (didn't like it at all) or when using playlists (I don't use play lists).