I can't answer that as I only use the Glass, but from what I've seen, some grits behave very similar between the 2 & some do not. But I can say that I have been absolutely satisfied with the Glass stones for everything I do. I'm a knife maker and use CPM3V & CPM20CV pretty much exclusively. I have also done professional sharpening service for law enforcement officials. I've sharpened many, many different kinds steels including many super steels besides my 2 favorite already mentioned. He has brought me M4 knives in the past and yesterday he brought an Elmax(still easy) blade along with a D2 & 1095. (On a side note: I find it rather humorous when someone here talks about HOW DIFFICULT steels like D2, or S30v are to sharpen. WHAT?!?) Anyway, as for pricing, I just spend some time searching when I make any purchase. And I also always search for online coupons. I've been able to save HUNDREDS of dollars more than once, just by putting in a little search time on Google! When you're making a large purchase, and already had planned to spend the money, then find it for $100 cheaper AND a 10% off coupon code?? Now that is a serious WIN! Puts a smile of accomplishment on my face just thinking about it!