If you notice that the saddle rails on your comfort saddle are wider than the Thudbuster seatpost, there is a simple workaround that only requires an additional step. 

If you unscrew one of the Philips-head screws (see picture below), the saddle rail relaxes and the saddle can be installed normally. Once installed, the saddle rail can be returned to its proper location and the Philips-head screw can be tightened down.