I just bought Freespace 2 and got MDK2 for free with the code. (you can buy 2 Interplay games for 1 - or a Codemasters game and then get a free Interplay one)
The site's design is great IMO, the best catalogue browsing I've seen from these DD sytems. I know that the traffic is kinda low, but the site is really fast too, and buying the games is very easy. But the content servers seem a bit slow (bit-cast, something like that). I downloaded a wallpaper right now which never got past 50kb/s - I'll test with the games later.
Their catalogue right now isn't huge but they got a lot of Interplay games (MDKs, Descents & Freespaces, Fallouts, Giants, Messiah, Sacrifice, Shogo, etc) and a few Codemasters games, but right now only Perimeter and 1nsane are available (9.99). All Interplay games are $5.99.
the words above were backed by NUCLEAR WEAPONS!