If you are looking for 1) a full-flow quick connect set, and 2) durability, look no further. I've tried ALL the other available full flow quick connect sets for garden hoses you can find on the web. All of the others are completely or at least partially plastic and leak outright or start leaking after a year. This is the only set I've found that is made from brass and it makes a world of difference. They also include easily replaceable washer. If you don't need full flow, you have less expensive options -- but seriously, stay away from the plastic.
The best feature of these couplers isn't even called out in the copy....they don't reduce the flow of water. I wasn't able to find ID 5/8 and top quality couplers at any other supplier. Already bought a bunch in case they stop making them.