Monday's (two day growth) shave with a Vision + new Trig blade was not a happy experience. It is the first time I have ever stopped part way through a shave, because of the pain caused by the blade trying to pull whiskers out rather than cut them. Interestingly, I put the Trig in the slant to finish off and the shave was tolerable. I have long suspected that the less sharp blades benefit from the slant; and am now convinced that the slant does have a different cutting action in practice, which was not replicated by angling the Vision - suggesting the (merkur) slant is more than a HD at an angle.