I too have just gotten the mulching kit for my 54c and it seems to work well. One of the reasons I got it was in the hopes it would handle all the leaves I am now accumulating. I haven't ran it yet over areas that are heavily covered so I can't report yet on it's effectiveness but others on here have reported it works well. It did seem to do a pretty good job on mulching grass though. As previously said, the kit consists of 3 mulching blades (they are actually a little different than the orig blades), 2 plastic baffles that take up a lot of the extra space underneath the deck and an optional metal attachment that you can use or not use to prop open the vent cover to provide some extra clearance when traveling on uneven ground.