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It is a good game. The only problem was the release so close to the big AAA games of this year like BF3 and others. I guess this hurt their sales pretty big. (I don't have numbers ofc.)
To sad they couldn't release it in summer.
Alien Swarm is free. So everybody owns it ...
I would like to join the beta. :-)
I bought the game yesterday and - as a fan of Co-Op, FPS and Tower Defense Games - i love it. (Much better than I expected from the Metascore)
You should definitely download the demo if you like these genres.