Following months of rumors and tons of hype, Spotify finally made it's US debut last week and... we're curious as to whether or not you've switched to using it for most of your mobile music fix? Given that iPhone users could already choose between Pandora, Slacker, rdio, Napster, Rhapsody, and pretty much everything except Zune Pass (come on Microsoft!), not to mention Amazon Cloud Player, Google Music Beta, and iTunes sync (and soon, iTunes Match), there's some strong, established competition for Spotify to contend to.

If you did switch, why? If you didn't, why not? What's most important to you in a streaming music service? That they offer tons of tracks, that they let you upload your own, rare music, that they offer streaming or subscriptions, that they have playlists or genius/recommendation engines?

Bottom line, have you switched to Spotify or are you using something else? Vote in the poll up top and give us the details in the comments below!