Ok, so I have been using the wheels for a few days now with mixed results. I have had some really scary sharp knives, and some not so great, however I know that with more practice I will achieve consistent results. Anyway, not to scare anyone away from the paper wheels, but I had a little incident while using them the other night, which I feel is a great safety lesson to share with other beginners.
I bought a 6" Ryobi bench grinder from a popular home improvement depot for my 8" wheels, and was happily grinding away on a few knives (wheels rotating toward me). I quickly realized that the grinder I bought was just not the right fit, that is to say, the distance between the wheels was too short. This didn't really bother me too much, as the knives I was working on were smaller folders. About a week before I bought the wheels, a friend of mine had given me a large machete to sharpen, which I had been working on with files, hones and strops. I grabbed the machete, which was already very sharp (stropped on leather with 1 mic Boron Carbide) and started working it on the buffing wheel. Everything was going fine, although it was a bit awkward because I was concentrating more on trying to avoid running my hand and the machete into the grit wheel. Somehow I found myself buffing at about the 4 O'Clock position with the machete edge facing into the wheel. At exactly the moment I realized what I was doing wrong, the edge of the machete caught the wheel. The machete flew directly into my stomach, and it was just blind luck that I got hit with the wide, flat side of the blade instead of the sharp edge. I just sat there, stunned for a moment, then quickly began checking for injuries. When I lifted up my shirt, I could see a long, wide, red mark across my stomach, as though someone had hit me with the flat side of a 2 x 4. When I finally turned off the grinder, I saw that both the buffing wheel and the grit wheel had a deep gash, about an inch into the paper material. Thankfully, I was able to repair the wheels enough to keep using them, however I have since remounted them on a much wider grinder. I am sure this has already been said many times in this thread, but I want to stress to new users of the paper wheels to get yourself a nice wide grinder or buffer for the wheels, so that you have plenty of clearance, PAY ATTENTION TO WHAT YOU ARE DOING, and AVOID ANY DISTRACTIONS while using the wheels. Good luck!