I used a Delco single row pull behind tree planter to plant 16K of red and white pines on my land. It was on open land and the results were great. This was in the late 1980s to early 1990s. Now these pines have been thinned once and the remainder stand over 40 feet tall. Amazing what time and Mother Nature can accomplish.
I do like the attachment and am sure it has its uses.