Fun and easy for both players and GM. I play and run in Cortex, and it is a blast. It isn't my favorite system, but it is probably my second favorite. My only quibbles are that it is hard as a GM to make use of the vehicle rules without adaptation (a common problem I have with a lot of games), and hard to make really 'special' equipment for players to earn--though both are conquerable problems, with some work.
[5 of 5 Stars!]