[DeepSix]

To go out on what I am sure will be a controversial limb (although not for the sake of stirring any up, though): I don't like the idea of selling military tech to the Chinese either; however, as others have pointed out, it's an F-16 in shape and wing, but not necessarily in other ways. Even if it does not use the fuel hungry Russian engines, it still lacks the range of new birds like the F/A-22, which can cruise at supersonic speed.

A lot of how you look at this depends on how you look at air doctrine. The U.S. seems to be moving back toward the tactical bomber role after the last couple decades of favoring air superiority (they sneak in the "A" in the model number; I think even the F-117 was originally conceived as a "B-x" or "A-x" plane). I'm not saying one doctrine's better than another, just that the U.S. seems to go in cycles. In the late 50s and early 60s it was all about higher and faster, then it evolved into favoring maneuver. The F(A)-22 may or may not be the ultimate fighter, but IMO the U.S. is still setting the pace in terms of R&D. Selling the J-10 *may* not be giving away as much as we think.

Just my opinion.