I've just bought the Omega with the stock 10" Elliptical concentric coil. What benefit would there be in getting the 10" DD ?? Or maybe even the 11" DD ? How heavy is the larger 11" DD, would it make the detector nose heavy? And then to add even more complexity.........should I consider the 5" X 10" NEL DD coil? What benefits would that coil offer, or are they just junk? I shy away from the larger coils because i like to hunt about 6 to 8 hours per session. Small coils lack coverage so my question mainly pertains to the 10" to 11" ellipticals.......thanks for your opinions and suggestions.