A few years ago, Southwire also told me the same thing, but still did not answer my question.What will protect the insulation during the remainder of the pull if the nylon is damaged during installation at the first bend where it enters the conduit? The parrots always gave me the same answer when I asked them that the first time. Those reasons alone make me distrust the stuff. The large feeders and underground work that I specify often require XHHW-2. In the past, I've encountered nylon separating right away as soon as the wire is unrolled and entered the conduit. Upon further inspection, the underlying insulation had been damaged further down the conduit run and had to be removed and replaced.