I don't use one either, If I felt I had a need for one I would build my own.
That being said, I realize many woould rather spend time using tools than building them and that's O.K. too.
The Wolverine has been around for a while, I don't know if it was the original using this desig.
I do know that Wolverine also makes various attachments that allow the user to sharpen many different types of chisels.
Before orfering any of them I would check to see what different attachments are available in conjunction with the different tools I may want to use it on.