I did this quick sketch in my Stillman & Birn Alpha sketchbook. It was my first time using it. It does say that it can take light washes so I didn't use my regular watercolors instead I used watercolor pencils. I think I prefer watercolors over the pencils however I didn't want lots of buckling if the paper couldn't handle it. This sketch was done quickly and so I guess the 'sketchy' watercolor pencil marks are fine.
The paper is really nice to draw on. I think I may keep it just for dry media work from now on.