I bought 2 because I wanted variety, and I was not knowledgeable to get just one and be sure that is what I needed. Also, I sold a SR to a Coworker and told him I would get a hone off ebay for him. It was such a nice hone, in near prrfect condition, I convinced him he didnt want to learn how to hone and that i would hone his for him when he was ready.
I also bought a cheapo loupe to look at my edges (I buy a few off ebay) I need to know if any flaws are completely removed when honing. It was 10$ from China.