Thanks, I find it pretty confusing as well. I am going to order one but did not want to be surprised with something that I was not expecting.Looking at the specs, it appears to be identical to the TD17KVX. On another site someone speculated that the "S" represents "stand" (as in drum rack). I don't know if that's true or not since both the TD17KVX and the TD17KVX-S come with the same rack stand. I find Roland's kit labeling scheme to not be very intuitive, except for the module designation.