I previously used river anchors, cleated & fluted/Danforth types. I recently moved up from a 5500# boat to a 9000# boat...decided to try the "box" . My boat is 31 ft and I bought the next lowest sized (medium) BOX anchor than what was recommended as I am not using it in fast rivers or the ocean, just big lakes. I found that in relatively mild waters, it will hold with about 15% of the anchor rode required for a Danforth. The only disadvantage is weight & balance.....it does also pick up a bunch of mud!! But, it works and that is what is important. If you ever anchor up with others, this is what you need.