When I tried this product, it kept chattering, causing my material to chip and splinter. The bearing was wobbly making it difficult to control the cut.
Worked great on first job but bearing blew out second time. I don't need to tell you what happens to your work when the bearing sliding on the surface of that work suddenly disappears. As a result, it turned out to be a lot more expensive than $15.
Pros
Tungsten Carbide cutters, hardened solid steel (45 steel) Anti-kickback body
Ordered two pieces for routing guitar bodies. Both failed, one catastrophically, after combining two 2-inch tecasters. A hard soft maple and a soft maple with purple heart plates. The first part exploded when it hit the purple heart. Unfortunately, they are not suitable for woodworking.
Pros
Cuts all composite materials, plywood, hardwood and softwood