I have been playing with this knot lately (the cairns quickie) especially because it is quick! It looks good with heavier lines, however on the lighter line classes and casting/working lures with jerks and pauses i have had the knot untie?? I have been using fluro carbon and trimming the tag fairly short. Not sure if this would be a problem with a non fluro c leader. To overcome this dilemma I have been leaving a long tag when tying the knot, then with the tag tie a uni knot or similar back onto the leader. This has also helped it travel thru the guides when casting also. It shouldn't affect the strength of the knot, its just a means of dealing with the tag reducing the chance of the tag slipping out from the braid loop.
I expect this to not be a problem when using heavier softer lines.
Has anyone had similar problems?
here are some pics of the way i have been finishing it with 10lb braid and 20lb leader.