I am able to listen to music at both of my jobs, and my library is getting tired. I'm constantly on the look out for new music, but don't have the money to buy it all or the time and desire to download it either.
$5/mo compared to $10/mo of Spotify. I tried to gather information but there wasn't too much. Seems the biggest difference is in the user interface, with Rdio being much cleaner. I had Spotify's app for the free radio, don't recall the interface being that big a deal. But the cheaper price tag for Rdio works for me.
A big plus is that it scrobbles to my last.fm. I love having my plays tracked.
So far, I dig it. I have run into a few instances of bands not being in the database, but I listen to relatively obscure music. The app does lag a bit sometimes, and it crashed on me. Nothing that will keep me away from it though. Really, my biggest hang-up is how much data it's going to use and how much battery it kills. Otherwise, I'm pretty satisfied. $5/mo is affordable even for me and I think I listen to so much music it's a justified purchase.

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