Useful, definitely not a gimmick, and something that they should really consider licensing out to manufacturers who already make good prosumer cameras instead of trying to wing it on their own. It seems like a waste of resources to have them working on their own firmware, physical design, marketing, etc. when all people really want is the technology in the cameras they already own (modified to use the new tech, of course.) I would pay a couple hundred extra for a camera with this built-in, and I reckon pros would pay many times that.