I do have a Suehiro GK20K. It does produce a very sharp, very smooth edge. However, I cannot say that it is any better than other stones followed by pasted strops.
For a while, it was difficult getting CBN. Ken Schwartz was the primary promoter of this method and he passed away. I recently found that KME has several emulstions in stock along with kangaroo leather strops.
https://www.kmesharp.com/cbnemulsions.html
Diamond pasted strops can be overly aggressive. If you apply too much paste or spray to the substrate, it can be too aggressive and you will get microchipping. The same thing can happen if you use too many strokes. That is why I use CBN pastes and sprays. They do not seem to be quite as aggressive and are not as prone to microchipping. Thus, they are more forgiving.
Microchipping, however, depends upon how the razor steel is heat treated. I have one razor that microchips no matter how I hone it. I think the steel was improperly heat treated. Other razors will take a super sharp edge without microchipping.
Never try to make a razor sharper than you need it to comfortably shave your beard. I have a very tough beard and very sensitive skin. That is why I like super sharp, super smooth edges. Unfortunately, the downsize of producing such an edge is that it will only stand up to a few shaves before it needs to be refreshed.