One of the best kitchen purchases of the past decade!  This board is large enough that you're not fiddling around trying to keep your pastry/pasta dough/cookies from falling off the edge.  The 2 lips keep it in place and prevent anything falling off the back.  Don't think twice about this.  Life changing if you like to bake and don't have a huge butcher's block or wooden countertop.  One fun tip, it works well across a corner counter and it's big enough that it doesn't tip off.