F6 or Monza(WOG) coolers are great value for money if you can get them cheaply. I have seen both F6 and Wog coolers sold second hand for under $250 and at that price they are a cheap upgrade for anyone wanting to upgrade their standand XR6Ts cooler. I wouldnt bother buying a Monza cooler as the performance gains over the F6 IC would be minimal. Save the coin and put it towards other mods.