Last year I switched exclusively to Fluorocarbon leaders, and went the entire season without losing a fish to "bite-off". In the previous season I did learn that all fluorocarbon leaders are not created equal. I won't bad mouth any company, but will say that Seaguar Leader has not failed me yet. It may be expensive, but it my opinion worth it. I generally use 30lb for pike fishing leaders, and it even held up for this beautiful old girl last year.
Simon