Really you can't buy the pugs and cable and make these yourself for much cheaper that buying these, as I bought these out of laziness as to not make my own. The pins on a few plugs were out of line, due to the little round plate they are attached to being able to rotate. Once I realized this, I was able to plug them in and lock.
But based on the price, I cannot complain on this quality aspect. The cables I bought are permanently plugged in the back of a rack in a patchbay and having worked in many live situations with XLR plugs and cables, I would guess that in heavy use these would not last long, but for heavy use I would buy something a little more robust.
But at little over 2¤ per cable, if it breaks, throw it and buy some more. Great for price if they don't move once installed, otherwise spend a few cents more on something you can rely on if you are intending to plug in and out a lot.