Today, I completed my 42nd consecutive shave with DR Harris soap. That's seven weeks of shaves. During this period, I have tried Dorco ST-301, BIC Chrome Platinum, Derby, and Feather blades. I am pleased to report that my initial assessment of this soap was correct: this soap has a very broad process window. It is very easy to get a good lather and a great shave with DR Harris soap.
So much so, in fact, that I think I have cut a full minute off of my shave time. You just don't need to work to make a lather with this soap. It just springs up into a great working lather quickly and easily.
Based on visual estimation and upon my weight measurements, I am convinced that I will get well in excess of 100 shaves from this single puck of DR Harris soap. A typical can of shaving foam is about $3 and will give about 20 shaves, a cost-per-shave of about 15 cents. This puck of DR Harris cost $15. If it gives 100 shaves, which it will, then the cost-per-shave of lather with DR Harris is the same -- or less -- than canned foam.
By comparison, a puck of TGQ typically gave me about 40-45 shaves and cost about $12, a cost of at least $0.26 per shave. So, I have always said that the value proposition of DE is that the lather costs a bit more, but you ore than make it up on blade costs, Well, with DR Harris, the cost of lather is the same and blades are still significantly cheaper.
My conclusion on DR Harris is that TGQ has to move over, DR Harris is my new favorite lather,