Review on Dewalt DW5440 16 18 Inch Carbide by Marcos Fiallo

Just received so can't comment on durability yet. If I understand the expression "elongated tetrahedral helix" to mean that the cutting tip is in the shape of a plus sign (+), then the description is incorrect. The one I received has a standard two groove design. The accompanying note on the packaging states that it is guaranteed for life against breakage through to complete wear and tear. It's rare to get a guarantee on a tool that has to cut the toughest of materials. Considering the price, this is a very good deal.