I use the Lansky, in the three diamond stones version, as well as a two sided dry stone.
I am not fully convinced of the Lansky virtues, due to:
-not satisfactory suggested sharpening method; for a long time I followed the leaflet directions to use, resulting in a dull blade; eventually, I succeeded in sharpening using the stones like a file, i.e. back and forth instead of one way only as instructed;
- round section of the guiding rods; a flat sectionwould be more suitable
- coarse threaded screws fastening the stones to the handle; with vibrations they get loose
- coarse threaded screw fastening the knife to the vise;
- non availability of spare oil; according to the owner of the shop where I bought my sharpener that oil is superfluous, to be replaced by any other light oil, or water, or nothing at all and he was right
- silence of Lansky when I wrote them about a.m. points.
Happy to read other comments.