My understanding of the problems that other owners have had with the Spectra rudder lines is that the culprit is chafing of the line, not breakage due to excessive tensile force. The Epic rudder/footpedal/footrest system weaves the Spectra through a hole in the pedal, then out of sight behind the footboard, where somehow slack is either taken up or let out when the footboard/footpedal assembly is moved forward or back. One cannot see the path that the Spectra takes, once it's behind the footboard, but it is probably convoluted, with opportunities to chafe in various places. Like Nhk, I chose not to risk any possibility of rudder failure, and replaced my Spectra, but with stainless. I've never had a moment's problem with stainless on my other boats, with 15 years in place on my previous boat. But I'm pretty sure that stainless can't be threaded through the Epic system like Spectra or Dyneema, so I gave up the ability to move the footpedal/footrest assembly easily forward or back. But my confidence in the stainless is very high.