I've owned his tool for at least 15 years.  I do woodworking as a hobby so I use this tool about once or twice a year.  When I do use it, I will sharpen my planer, jointer, chisels, and cooking knives all in one swoop.  This is a great tool.  When I first got this I knew little about sharpening and boy did I have alot to learn.  Assuming whoever reads this knows about sharpening, you first sharpen the back(a little), then set the main bevel, and then create a micro-bevel.  I bought the rough and the 4000 grit wheel, but I never use them.  If something needs a lot of metal removal , I use a bench grinder with Norton wheels.  Im my opinion, the whetstones work better after about an hour using them.  I think this is the water absorbing in the grinding stone. Its all about the slurry thats created. I learned to soak it an hour before using it. Wear work clothes when using this.  There's a lot of splatter as the slurry contacts the knives.  It doesnt come out of your clothes.  When done clean the metal particles off the wheel.