LOL, I use Derby blades six days a week - but the reality is that I'm usually using a single blade for up to 30 shaves. Dark hair, stronger beard. If you start getting over 20 shaves out of most of your Merkur or Dorco blades, post here and let me know. ---- I bought a container of Cella shave soap as suggested here. I'm not sure it holds an edge to Prorasso, and surely isn't equivalent to, let alone better than, Truefitt & Hill as some review I read recently posted. It's good enough. I'm not getting it to lather any better in a mug than I am by just applying it to my face (like I do these days with Prorasso). Am I doing something wrong? Sometimes a loaded brush doesn't even seem to hold enough lather for a second pass... where-as that hasn't been the case with just about any shave soap I've used in the past.