I have no issues with its knot strength blair. I fish 6lb Berkley Vanish all the time, tied to 4lb Berkley Fire Line in the dark grey colour. It's landed flathead to (estimated) 15-16lb as they were released, as well as a 22lb jewie back around Christmas this year. Occasionally we hit salmon in the estuary and it's coped with them to 8lb. That's fully loading 1-3kg sticks. Almost exclusively use 3lb tippets when fishing Eucumbene. ( I note it's still going down rapidly) Sometimes I wonder if we lose ourselves in some of the tech stuff which is something that does nothing for me. What do you think?