I have personally talked to F-15 pilots who have faced the Raptor in training exercises. It is as much of an advance over previous technology as the monoplane was over the open cockpit biplane. There simply is no aircraft on earth that can match it. It is limited only by the amount of armament it can carry.
If we can keep some limited production going until 2012, and vote in a President with some common sense, perhaps then we can build to the originally planned total...or more.
The only 5th gen fighter out there. My prediction months ago is about to come true. The F-22 production line will live on and on.