I wasn't impressed by the photo in the book for this stitch, and after doing several rows I was even less impressed and it was pretty hard for me to get motivated to finish the square. I personally think that the stitch would better be described as "Beads on a String" if it were each row alternating popcorn and front post double crochet instead of every 3 rows, but that's just me. This stitch, or a variation thereof, would probably actually look pretty cute if it were alternated red and green for a Christmas lights look.
I used Red Heart Super Saver Burgundy with a K hook. The stitches came out much tighter than I'd like so the square is a bit on the small side, and looks a bit scrunched up.