Avast Thar Mateys,
In my case, I wanted to be able to use the FC-300 to change program setups quickly, such as going from my standard kit setup to a jazz brush setup just by stepping on a switch, without having to go to the back of the Jolly Roger Zendrum and manually selecting a setup on the data pad. A footswitch was more convenient and I could switch from drums to percussion etc. with a single motion instead of multiple motions. This is really a good idea especially for jazz, where you switch between brushes and sticks fairly rapidly. Also, the FC-300 can run on batteries, which means no cables or wires. What a concept. And being that I use a Roland TD-20 as my primary sound source, it seems to this olde salt that the Roland FC-300 would probably be a better choice. I could be wrong (did I just say that). Arrgghhh, shiver me timbers! I thought I was wrong once, but I was mistaken.
Fair winds and Following Seas,