I bought a 6kg Delta anchor this afternoon to replace our cheap 7kg CQR.
I did a test on wet and dry sand by dragging it by hand. I tried to keep the rope as horizontal as possible but probably not a great test. However it was true to its name and just ploughed a big ditch. Interestingly this is what yachting monthly found in 2006 with the Delta. Think we might get something else, don't want to drag on a lee shore up the coast.