Review on Plastic Drywall Anchors by XFasten - The Ultimate Drilling Solution by Ryan Olsen

These work much better than traditional drywall anchors, although they are a bit more difficult to use. You still need to drill a pilot hole and then screw it into that hole. They also don't damage the drywall when removed, they just leave the hole you drilled to begin with. However, you must be careful. They are very brittle so if the hole is blocked with a bolt they will break. Otherwise they work great and are very stable once installed.