Stump,
I believe the seaguar flourocarbon is the best leader material made bar none.....this past week while perch fishing with minnows I landed 3 pickeral 18-21 inches, two 22 inch northerns, and one northern that went 27 inches all on 4 lb. seaguar flourocarbon.....no bite offs yet this year and I've landed numerous toothy critters on it. Plus it's really supple and I believe it has better knot strength than the berkely vanish....just my opionion though
-IceGeek