So far (I'm quite new at this) I haven't liked them. They came with my EJ 86 so my first DE shaves were with one and it was an improvement over cartridges, but the moment I tried it with a different blade I saw an immediate improvement. In addition to the two blades left in my original tuck, I have one blade from a sampler, and the two RazoRock razors I ordered came with a tuck of Derby so I have 13 blades to use. I plan to give them another chance in a few shaves to see if they are better now that I'm a better DE shaver, and I plan to give them a chance every couple months, but I suspect I won't be buying more.