Has anyone used the Castwell knot with a furled leader? Have you ever lost a furled leader using this knot?

It's just to simple, it can't work .....there's no way unless the knot takes a few hours of practice, has a minimum of 16 different twists and turns, and has the word "surgeon" in it someplace, can it hold good enough to keep from losing my furled leader.

I only have a couple of furled leaders at this time and don't want to loose them, but that knot is so simple it's very tempting to try.

Tennessee Jack ...... what say you?