I really like mine. I bought one last year and found it really helpful. It had: chalk for my boxes, the diamond surface for my crystals and glass calls, the abrasive pad for my slates, another abrasive pad and notch for my striker tips (very helpful), ...all in one little package. I have never really used the stone edge.

I really like mine. Well worth the $ 6 or 7 dollars it cost at Wal-Mart.