Are you talking about rotary cable strippers like
this? I've never used one either but I would love to know how they work.
As far as the smaller wires once you get the jacket off be careful of the strippers you see at home shows that look sort of like this:
While the product is a great one if built correctly with metal, the one's I've seen at the county fair and home show's tend to be made of plastic and break easily, I've broken two. So shop around for a good one made with lots of metal it'll last you a long time. GB, Klein, or Ideal all make nice ones for around $20.
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