Epitome of durability with diamond coated sharpening devices
Depending of the quality of the product you can expect
some lasting longer than others. If you find a Brand with some extra quality then the advantages can be several. In my experience I have used cheap and more high-end types. The high-ends ones got a more even grit surface that is within the limit of the Micron
or Grit number mentioned. They will also make sure the durability is longer.
Usually all will be a bit different the first times you use them and by that I mean the complete 30 micron range
will sometimes be present after a few times of use. In time when it is getting worn it will become a finer surface. 600 grit or 30 micron will be finer when diamond coated stones are getting worn. Therefor I always recommend not throwing away old worn diamond
stones because you can use them to polish the edge.
The amount of pressure you use during all sharpening will in my opinion influence the grit. Some may say that this is not possible because
600 grit is 600 grit. It is not so because the amount of pressure can yield another surface. The 600 grit surfaces can actually close to polish an edge when you use very light pressure.
experience the diamond coated stones are best after a few times of use and they will transform into a finer device in time.