I tried 50# Berkeley Vanish a few years ago when I was fishing a lot of pike. Never had one bite off., Never lost a leader to a snag. I was also using 50# Power Pro braided line. Usually I would either pull out the tie ring or straighten out the hook(s).
I stopped using it on a regular basis because the lake I have been fishing the last two years is filled with hammerhandles and eater walleyes with the odd smallmouth thrown in. I use 20# uncoated sevenstrand wire leaders now that are brown in colour. With the stained water and many weeds, the fish don't seem to notice the leader.
I liked using the flouro leaders at the time, because they were more flexible and less visible than wire. I just tied them to the snap and swivel using the Trilene knot.