I've been using the Davy Knot EXCLUSIVELY now for four years now. In that time I've had two failures...and I can say for certain one was a mis sized hook to line ratio...the other was because I hadn't checked the knot beforehand. Two missed fish because of a badly tied knot isn't bad at all. I lost a lot more using other knots. I use this on the tiniest of flies, like #28s to the largest that I currently fish which is a #4, rarely a #2. I've tested this on Chinook, Redfish, carp, steelhead...all with great success, and I'm satisfied that it's the best knot for me. It's easy to tie. So easy I can tie it in the dark. I don't have to count turns or even wet the line before seating it.

If you are using a smaller tippet on a bigger hook, you will have slippage. TEST the knot. If you are not sure that it's well seated, tie the double Davy.