I just bought both. You'll get 4 downloads for each show and can download MP3 and/or FLAC. Quality seems pretty good to me, but I'm not an audiophile.
Limiting number of downloads protects their bandwidth from would be jerks. Protecting their service is important for their customers to have a quality experience. It's fair, and most people will only ever download once. If they for some reason use up all 4 downloads and want more they should e-mail them. Why wouldn't give more if some had a genuinely good reason for using up their downloads?