The Hell Cat has DOT technology and Dynamicore, with the Havoc coverstock, I saw a much stronger reaction. Bowled on the 41ft Bear and it was way too strong with 1000 surface. Compared to the Hell Raiser Blaze there was a good 5 boards difference in reaction. Ball was clean once it saw the end of the pattern, it was moving at the rack. Drilled mine 45x4 3/8 x 65(this is pin down for me).