I've had 5/32 amsteel part mid-line. I was using it as a low mileage jib downhaul upwind on a Tornado in 25kts and 6' steep (building) wind waves., and it parted where it passed by the forestay chainplate. I could feel no sharp edges on the hardware, and vectran has worked fine in the same place, so either amsteel single braid is very chafe sensitive, or the line was somehow defective.

I've had no problems with Vectran or Spectra.

--Glenn