I have been using the 30lb. DuraTuf for my leaders and I absolutely love the stuff. I did a comparison with all of the other 30lb mono brands that Gander Mountain had in stock and the DuraTuf was the strongest. So far I've had flatheads up to 30lbs. on it and it's been awesome. Excellent tensile strength, excellent straightness, excellent abrasion resistence. No doubt it will perform equally as well with much heavier fish. Side by side field comparisons with Berkley XT have the DuraTuf seeing less break-offs and more fish before change-outs.