Mr. Crawford had done a good job of making a system run your cyberpunk game with an old school d20 familiarity. The biggest thing about Cities Without Number is it's compatibility with Stars Without Number; this will add a lot of richness to your ongoing SWN game. If you're committed to the level/class style of game play, this is an excellent game to have.
My only critiques are that all of the setting material and tables are trapped in the early 90s and that the class/level based system isn't the best way to do cyberpunk. If you bring your own setting and use the tables to fill things out, they have value but I don't think it's the best way to build a setting from scratch.
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