We have recently returned from a five month cruise of Stewart Island and Fiordland and not once did our 50lb Manson Plough Anchor let us down. We even spent a night anchored off Nugget Point on the east coast of Southland with winds in excess of 70 knots and whilst we did maintain an anchor watch all night it was not needed as we did not move an inch.
I was concerned that perhaps the 50lb may have been a bit light for my yacht which is 41 feet and weighs 17 tons, but after that trip plus a Marlborough Sounds trip before that, I confess I am totally sold on your anchors and would not hesitate to recommend them to anyone.