I initially bought this to cut backerboard for some custom tile work that required a lot of odd cement board cuts.  It works great for that and makes quick work of it.  I also use it for making rough cuts in tile for toilet holes (that won't be seen) and other masonry applications.  It will cut metal, plastic, wood and all sorts of stuff.  I use it in a Dewalt 4-1/2 grinder and it is my do-all blade.  I have all sorts of grinding/cutoff blades but if this is on the grinder and I need to do a quick cut on a piece of metal, it will do.  I recommend this product to many people.