The number of fish I have seen lost by anglers who didn't test their hooklinks before casting them out. It took me ages to find a good fluorocarbon hooklink, I was never comfortable with the knot to swivel. Even D-rigs I made sure I tied carefully as I found the inside of the hook eye could cause a flaw in the hooklink. I went to the extreme of tying the hook on, then forming the D from the tag, and whipping it in place with thread, very fiddly!
The Spiderwire I have never found a problem with though, although I do use the Rapala loop knot to join the mainline swivel on rather than a blood or Uni knot.