I combine marker with colored pencil. The combination of wet and dry gives me more depth, texture, and mark versatility than is possible with just marker alone.
I love my X-Press It. The problem is that X-PI is everything a colored pencil paper should not be.
X-Press It is super slick with a slightly resistant surface. Way smoother than hot press, it's Bing Crosby driving a Zamboni eating butter kind of smooth.
Meanwhile colored pencil likes things gritty. Artists call it tooth; a good colored pencil paper has tiny jags and crevices which grab hold and collect pencil pigment as you color.
X-Press It cardstock is as toothless as the starting line-up for the 1972 Red Wings. Trying to color with colored pencil on X-PI is like spreading grape jelly onto a greased pig. About 70% of what you lay down ain't gonna stick.
So not to make light of Sophie's Choice, but at the start of every project, I'm usually standing at the train station trying to pick between X-Press It for Markers or Vellum Bristol for colored pencil.