Just picked up a complete XL slide for my X. And also some baseplates from Tactical Development that are made to match the WC grip module as well as fill out the empty space at the bottom rear of the factory baseplates.
Not sure if I like the look of the XL slide on the gun yet. It just seems a bit long and out of proportion, even with the 15rd mags. Most important factor will come at the range though.