I recently purchased Music Store and had a few issues, but the support was not only accurate, but very timely. If you're wanting to sell music downloads, this is the plug-in you want. It provides a means of sampling the song(s) and protecting them at the same time.
The best part is
strongit is very easy to use!
/strongAnd their support is fantastic--I had a few issues with my website but they responded both accurately & timely for support which was right on!