I have/had a couple old Shapton Pros, bought 30 years ago. I had two a 2000 and 8000. One of my dogs knocked the 8000 off the counter, in the plastic container, and it broke. I would have bought a 1000 Shapton but at that time they were not available. Then I bought a set of Sigma Power Select II stones (3000, 6000, 10,000) from Stu, filling in around the remaining Shapton. I was never happy with the coarse stone in terms of speed. At Stu's suggestion I finally bought a big Sigma Power, 3F Carbon 700. Still not happy on the fast end I bought a Sigma Power 120. I never was happy when I needed to remove larger amounts of steel to repair a bevel/edge...My latest investment has been CBN wheels, which I love. Now I can grind away some steel.
I got interested in working green wood, which requires the use of some harder to sharpen curved blades. I was also planing to take several classes and wanted reliable portable sharpening that did not require water. I bought a couple Eze Lap diamond plates 2x6", double sided 400/1200 and a 600. I had been using Spyderco medium & fine stones for 35 or so years in my kitchen and liked them. George made his post about using Spyderco medium & UF stones about then. My big Sigma stones are too big & heavy & fragile to fit into my moving sharpening system so I bought the two very hard, smaller Spydercos 2x8", Medium & UF. Now my Diamond plates and Spydercos fit into my Festool Sortainer on a Festool Sys-Roll which can hold just about anything I need to travel and work. I also put a 2x6" piece of MDF & diamond paste in the Sortainer, just in case I need something super sharp. Now I have a mobile station I can move between the two buildings I work at, home & work, on 12 acres. If I want to go to a class I have most of what I need ready to go. The Sys-Roll can move around my shop and basement as needed too. I bought two round EZ-Lap rods coated in diamonds for sharpening the curved blades. I have a medium and UF ceramic rod too. These can go in a Systainer if I travel along with my rasps, chisels... that I have in roll up nylon holders.
I found in my first big green wood class that it is hard to work with dull green tools, especially with as much wood as gets worked to make a chair. I did not want to rely on the instructors good graces to keep my tools sharp. Instructors in those classes are very busy. Now that I have a mobile sharpening system that can handle practically any tool, except for grinding, I do not typically use water stones. It is just faster to use my mobile/dry sharpening system. The small EZ-Lap plates are very reasonable on Amazon as are the Spydercos. After 35 years using Spyderco stones I doubt I will ever have to replace a Spyderco stone, they just about can't be worn out. I doubt I will even need to flatten the Spydercos. If I have to flatten a Spyderco I have the diamond plates, which I suspect are the only thing that will cut them. There is a very long post discussing Spyderco stones that our own George started which covers just about any & everything about these stones and how they work well with a diamond plate system.