For 99% of the people buying subs, the CF cone is completely useless for anything other than looks. The guys who will actually see the benefit of this cone, are your extreme competitors who are pushing their equipment to the max. One particular situation that these would work for everyday build, is in a multiple sub 4th order setup, or any 4th or 6th order setup where you have subs directly in the port or subs closer to the front of the box next to the port where those sub unloading can become an issue and shred the paper cone. If you really need this cone, trust me you already know that you need it and what the benefits of it will will. For everyone else, its just sex appeal for your sub.