I got my 5 credits from Avis First, but am having a difficult time finding songs that I want. From their web page:

"eMusic sells music from more than 20,000 labels and 130,000 artists in the universally-compatible MP3 format at an affordable price. We strongly believe in independent music and its culture, and do not currently carry many mainstream, Top 40 artists."

I agree that it's a poor substitute for iTunes. I switched my weekly rentals to Avis until the last iTunes promotion ran out. I won't be doing that for any eMusic promotions.