For the mathematically inclined, if you download more than 50 songs a month, it becomes worth it.
But:
50 songs @ .79 a song = $39.50 in music
PLUS the $9.95 means over $50 in music a month. I sure as hell don't buy that much...even when the only options were tapes and CDs, I still didn't spend that much.
Plus, it's not like you can burn them as much as you want for free or anything...
Translation: Fuck it. It sucks. Use iTunes.