pro: why buy a cd for $20 when I only like 1 song on the whole thing when I can download the 1 song for free?
con:I see no cons really. there are currently many laws to protect downloaders as well, and 90% of the time, they only bust you if you have over x number of gigs of illegaly dowloaded stuff.
side note: as far as software goes, I try to purchase all my software, there have been a few times where I downloaded it and later actually bought it when I had the money. I was busted once for downloading some movies, but it was like 1 gig and after searching my computer decided it wasnt worth pursuing.