There's a really simple reason I continue to use a piece of software that hasn't been updated in over eight years, and that reason is that Audion is still the best sounding mp3 availble for mac. I can play the same mp3 through every player I can get my hands on -- iTunes, Vox, SongBird, etc. -- and Audion still has the richest, warmest sound regardless of speaker set-up or EQ.

If sound quality wasn't enough, I also still use Audion for CD ripping, as it's quick, produces good quality mp3s, and doesn't grind my entire machine to a halt while it works. And superfluous as it may be, I do like Audion's selctions of skins, which look nice and blend into whatever my desktop may be.

And while Audion does have it's fair share of bugs, none of which interfere with it's core of playing mp3s, ripping CDs, and playlist management. So if you're concerned with sound quality at all, I'd definitely give Audion a listen.