I dunno about the 9920, but the 9918 is only a 1000watt controller and I do not think I wish to buy BK agian, been threw 3 warrior 70s and 1 warrior 9918, to do a comparison the hacker is a quantum2 vs some duratrax 12t is like BK controller, guess if I want a real good product agian I will have to wait for Castle's offerings