.... forgot to add; in response to previous post about being called a fluke, 'cause it's a fluke if it works; The person who made the post may have just been joking?
I don't personally own any, or regularly use them, but I have on a few occasions from guying out a tent, to using them as part of an anchor for crevasse rescue. When they were used properly, they worked well.
A professional guide may be able to elaborate better on how good (or not?) they are as a piece of gear. Kurt?