The CORE gravel 65-30 surface works great for us and was easy to install. I decided to do the install myself, as no contractor was available in our area (typical for our area). My novice install of the CORE gravel system went very well. Our driveway has a slope in the area between the driveway and rock wall. The trimming of the grid was easily done with a jigsaw. The gravel is great to walk on and softens the look of the concrete driveway. This system now allows us to walk safely up and down the driveway when it gets icy or snowy.