I have used the Climax 50lb shock leader that came free with Total Sea Fishing a couple of months ago, but found it hard to tie knots in & when I did eventually tie them, they came undone a few times resulting in lost tackle. It was clear line and really thick.
I now have a new spool of Climax shock leader, but 60lb breaking strain, free from this months Sea Angler mag. This time it is green and a lot thinner. Haven\'t had chance to use it yet, but it certainly looks like it will be better.
Greased Weasel is the best I have used so far.