Like most previous X players, I'm stumped with the new version and have yet to place my loyalty order.
I loved the 2015 X model because it was made a touch softer than the 2013 model. In my opinion Titleist finally perfected the X in 2015 by eliminating that extra firm feel. Higher ball flight and low driver spin characteristics too.
Now for 2017 the marketing and review has it all mixed up, with some saying the X was *made* firmer, and some saying the only change to the X was the dimple pattern.