My opinion is that more valuable in progretion are the coarsest stones q as they can get the bevell sett razor and bring it to 7 - 8 K levell ready for finishing
I got an old combo coti , barber size and the BBW is so fast , coarse and precious for me beyound any other BBw stone , as it makes perfectly what is ment to do .
Push the blade so good thought6 the midle grits .