Having owned and anchored with CQR, Bruce, Delta, Spade and Rocna, most on the same boats, there is a marked differential gap in performance between the first three of that list and the last two. I do agree that the Delta is better than the CQR, but the gap between CQR->Delta is smaller than Delta->Rocna/Spade. Every anchor test done by all of those magazines and organizations have shown the same as our personal experience with them.
But I don't mean to turn this into an anchor war, and don't care what others use (as long as they are downwind of us! ), I was trying to clarify the confusion on sizing differences and pointing out that there are modern anchors without roll bars.
Again, if you have never used a Roca/Supreme/Mantus/Spade type before, you won't believe the difference. I get frightened if the boat starts gaining speed backwards when letting out the chain - there have been times when I have thrown the chain stop and the bows dipped and things fell off the table when the boat got to the end of the chain. These things set immediately and deeply - something we have never experienced with our 7 years on an equal weight Delta.
And if you want definitive proof that all those old designs are truly geriatric, Jon Eisberg owns two Spades and a Rocna, although he may have just taken those from the wreckage of his past couple of deliveries…
Mark