I spend between four and six hours sharpening knives every day of the week. I do my work by hand on Japanese Water Stones so owning water stones that not only result in sharper than new knives but are also easy to work with. They have to be relatively easy to flatten and in terms of water management, hassle free.
I have used Naniwa Chosera stones exclusively for years and now I use the Naniwa Professional series.
The 600 grit stone has surpassed my expectations. This is the perfect grit (particle size) for knives that are just dull, they don't need repair they just need the fatigued metal removed, the debris that makes knives dull. This stone is superb for that, it sets the stage for an extremely sharp knife by building a strong, clean edge. The feedback from the stone, the way it feels is excellent. As always, the service from Paul is absolutely second to none. If you are a sharpener or even learning to sharpening knives by hand, the Naniwa Professional 600 is ideal.