I just googled the X-One, and I would definitely NOT want that tread profile on all-pavement rides.

There are plenty of tires out there that have a very smooth center tread profile for straight-ahead pavement riding, and knobby stuff on the sides for light trail work.

Consider for instance also from Schwalbe, the Hurricane, the new Marathon GT 365, the Marathon Cross, Sammy Slick, etc.