Based largely on the early testing done by Panope but also on pricing and the excellent customer service that we received from the company we purchased a Viking 20. It's 5Kg lighter than my Rocna but physically much larger, with greater blade area and, like the Mantus, a steeper angle of attack and better penetration through weed and hard, crusty substrates. We only had it for the second half of the cruising season but still anchored about 70-odd times with it and never had any issues. When the wind picked up to about 20-knots and a 70-foot motor cruiser started dragging towards us we brought them alongside and the Viking held both boats rock solid.