I used Delta Hooks for years. I had a female unit on most of my attachments. The Delta Hook system is excellent and works great. I changed to Pat's system for two reasons. First, the Delta Hook female didn't fit on a couple of my attachments. Second, unless you have a female unit for every attachment, you obviously have to move a female unit from attachment to attachment. They are heavy, and in trying to plan for the future when I am not around to make these kind of changes, I thought it would be tough on my wife, for example, to change a female Delta unit from one attachment to another. Hence the change to Pat's system, which also works great. I will note, though, that I bent two of the female units by using them on attachments like a box scrape and then getting the box scrape hung up on a large root. The more recent versions of the Delta have reinforcement straps welded on that help prevent outcomes like this.