This is, in one word, fun. It doesn't focus on being uptight, or realistic (well, particularly realistic), or even a specific thing. It's simply action-espionage, be it from Bond to Bourne. You can play a gritty game, or a game with super-tech and action.
Spycraft doesn't burden or restrict itself. It is what it is, and it'll do anything it wants. It's d20 adjusted for a modern setting, but it does what d20 modern did not. It makes the game fun. Instead of worrying about how your character is arbitrarily defined, you know how they're defined.
The art and quality is top-notch, and if you want something like a simple spy game, this is where you'll find it. A brief glance at other spy systems (admittedly earlier in production), such as an official James Bond game, shows that where they failed to make a simple, easy system for all types of adventure, Spycraft has succeeded.
[5 of 5 Stars!]