I know a few people who swear by it. I for one think it's clunky and awkward. The face buttons are assigned to buttons on the grip of each handle, and they are a pain to press. I'd rather just have my thumb leave the analog stick for a split second then try to re-educate myself with an entirely different style of controller.
I think, I seen it too at Best Buy. The controller is brown with triggers that look like it's from a gun. It's called the First Person Shooter Master Controller...
ya its 29.99, I have it and I've had it since I got my Xbox last year. It still works fine nothing wrong with it. I love it the only thing is it's wierd to use it with the xbox live communicator, because it doesn't fit right so it falls out sometimes.