The 39C razor has become an important part of my shaving repertoire. My sense is that it is at its best doing what I term as "maintenance shaves". That is, one or two passes in order to get to an acceptable level of closeness. On very thorough shaves, it can become a bit aggressive. Every time I've done a third facial pass, I have found that I regretted it afterward. Not because I have actually cut myself, but because I have felt that I've put more wear and tear on my face than was warranted.