As I have posted any number of times, I believe that an oversized anchor is important. Plugging the boat data into the Mantus selection page, I come up with the 45# but I always go one size larger than recommended. I can say truthfully that I have never had an anchor slip once set and would like it to stay that way. I've been anchored through tropical storms and big blows and have never had a problem, even with my antique CQR
But the consensus is that these new generation anchors are much better so I'll bite but would not give up on pure, basic MASS as an important element.