I bought my X-Carve with the DW 611 in 8/'16, days before the X-controller and X-axis gantry upgrades. I picked up the "Wide MarkerSlide) 1/'17 but life happened and never got around to installing it (or using the machine since then.)
Looking at the current product, it doesn’t appear there have been any other upgrades since then, but wondering if there are, before I dive in and install the gantry.