Spotify was great in the UK, until the record companies in the US decided to impose some ridiculous restrictions to even consider letting them enter the market.
Before Spotify had intentions of breaking into the US market, you had to have an invitation to join Spotify. You could listen to everything for free, there were no play limits, no usage limits and only a few adverts.
And then Spotify thought it might be a good idea to get into the US, at which point the record companies decided that the advert based business model didn't work. Now all users are subjected to constant adverts, a 5 replay limit per song and a maximum of 10 hours of listening for the entirety of their account. That's not 10 hours a month, it's 10 hours in total ever.
That's why I stopped using Spotify. It takes me more than 5 listen throughs to decide whether a CD is worth buying, and I could easily hit the 10 Hour mark. Spotify claim that most users use Spotify to discover new music, which is correct. But with these limits, it's actually stifling the music industry. People have less money and need more incentive to pay full price for an album, Spotify was a fantastic remedy for that, at least until earlier this year.