I found this the most challenging of the stitches on the sampler. Again, the instructions are very clear and I was able to follow how to do the stitch. The difficult part, for me, was getting the correct tension and maintaining an even twist in the thread. However, I enjoyed the stitched and really like the braided look of the line of stitches - Braid Stitch is an alternative name for Knot Stitch.
I would like to try this stitch in a firmer thread or even a metallic thread as I think they would make a nicely defined looping stitch.