I must admit that I never had much use for a cable anchor, I guess I just did not like the idea of leaving them behind or having to dig them out.  Two years ago I watched Ron demo his product and I was impressed with it!  So much so I purchased two dozen of them.  I tested them the following season and had great success with them.  The following year I ordered up several more dozen.  They hold well in all soil types and with a slight pull of the retrievable side of the cable they come out without having to pull your back out of place!  Much lighter than rebar stakes. You can pack a bunch into an area without the weight of regular steel stakes.  18 inches of cable gets you down deep for a really good hold.