It takes up a lot of space on the counter and it's heavy enough to smash someone's skull, but it does seem to make a difference when rolling out doughs with butter or shortening in them.  I had a bit of a problem with the board sliding all over the place at first, but I used some little suction cups to solve that problem.  Together with my marble rolling pin, this board is making some of the nicest pie and galette crusts ever!  It also works well for bread.  I feel like dough does not stick to the marble as much as it does to my Formica countertops.