I run the de skids on my losi's and I have not had any problems with them. They are beveled enough so whether it's plastic or aluminum dragging, it's not going to be that much. I still set my ride height based on the chassis and not the skid plate. They do wear down quickly. As thin as those skids by de are made, if they are hitting, I am willing to bet 90% of the time the chassis is going to hit the same thing. In fact, because they do wear down so quickly, I am considering just running without them this year and making it an annual maintenance item to just replace the chassis.