There is considerable discussion about Rocna vs Manson vs Spade floating about. This discussion is somewhat contaminated by the defensive jabbing amonst some of the designer/manufacturers.
Given your tacit endorsement of the Rocna, can you give us some real life (NZ to UK via Alaska) insight into where the Rocna proves to be superior and when it does not (e.g., bottom types, fast currents and shifts, storm conditions). Thanks!
The Rocna has worked well for us in thin sand over coral in the S Pacific, heavy weed in the Bahamas, alluvial rock fans in Alaska and Greenland, and heavy kelp in Greenland and Labrador. No weaknesses that we have seen. The only less than perfect experience was in very soft river mud in New Zealand, but nothing would have worked well here.
We were initially concerned with the roll bar possibly being prone to fouling, but this has not been a problem.
The one feature we prefer on the Rocna to the other similar hooks is the very pointy end. This looks good for rock and getting through weed.
We often anchor on 2-1 scope in tight locations with good results – but then we have a big (in scale) anchor.
I suspect the Manson and Spade are probably similar in capability, but have no real world experience with them.