Well, have read through it. I think the classes are a little more flexible than I thought at first blush, but they are still most appropriate for an action/triller/investigative type game. For other types of game, the focus of the classes might not be quite right. James Bond / MI type games are the obvious focus, but I could see Die Hard, XCom: UFO Defense, the Chronicle, the XFiles, the Saint, or your typical Clancy novel.
The thing it needs some most: some flavor text! Betcha never thought you would hear that from me! But really, it could have used some salemanship, a few snapshots of characters in a Spycraft game to get you into it.
But the editing looks impecable, the layout is very nice, and the action dice are an interesting addition to the d20 system. I'd like to see how it runs in play.