I had real trouble with this stitch at first. I just couldn't get it to sit right. So I went back to practise (stitch 3) Feather Stitch and to learn (stitch 26) Up and Down Buttonhole Stitch (I found Mary Corbett's video for UDBS really useful). After that it all went much more smoothly.
This sampler is made up of all three stitches.
For further details about TAST or to see the list of all the stitches so far head over to Pin Tangle.