Dayz Addon For ARMA 2

I have just come across the Dayz addon for ARMA 2. Although this is merely an Addon and not what you would call a fully fledged MMO, from what I can see, this is a very good attempt at the concept, and a good move in the future direction of MMOs.

Much like many thousands of others, I feel compelled to buy ARMA 2, just so I can give this Addon a try. Has anybody played this and if so, what are your thoughts?

Please see:

http://dayzmod.com/