I would also add that, sadly, rdio has not kept up with Spotify's library. It also seems built less around the user's interest and more to get new music in front of people. Probably great for the artist's reps, but when Drake and 7 Days of Funk shows up under Heavy Rotation and I've never listened to anything resembling either, they've already failed.

And while I applaud their attempts at a native wrapper around HTML5, you can hardly claim that Rdio has "nailed it" with regards to their native app. It's a whole different product.