In my opinion, this is one of the most revolutionary and break-through products available to us percussionists.  The MalletKat allows me to bring all the mallet percussion, plus timpani, plus other percussion to the table without taking up all the room, and not changing/sticks or mallets.  Once again, built by a player/designer who knows the needs.  the learning curve is a bit challenging, but once you get the hang of it, the end results are very rewarding.