I'm familiar with the Razertip design, but wasn't very happy that it was the only thing available for a while after DetailMaster went out of business. I viewed the Razertip as less than satisfactory because most of the heat is dissipated in the wires rather than in the tip which makes it uncomfortable to use for any extended length of time. The cross section of the Optima (and the DetailMaster) tip is such that the greatest electrical resistance is in the arc of the tip which means that is the part that will get the hottest. I was elated when Harvey told me that Optima was able to make a satisfactory pen for him. Initially, it wasn't in their product list, but you had to call them and ask for Pat and say Harvey Meyer sent me ... sort of like going to a speakeasy.