I have used them to do the bulk of the work on their respective hones. The globular one is bound to an incredibly hard, slow coticule that is just nicer off water for the final refinement. The other is a choice Belgian stamped stone. I wish I could find it, I posted somewhere before my experiences with a big variety of bbw. I use slurry. You just have to experiment with Belgian stones in general. They tend to surprise with their performance ceilings