I never got to know this music until after Avicii left us, and wow was I missing something before! Supposedly there is a huge collection of unreleased Avicii tracks, but this is pretty much the "final album" until they come out. I never knew how huge Avicii was around the world. He just never really caught on in a big way in the US, though a few of his songs broke through.
Buy this album and you will not regret it (though I currently don't like the price for 6 tracks). You might be better off buying digital copies song by song.