I bought one at JoAnns that had multiple heads with it. I used it on a background that was built on those foundations that you iron on the fabric and then sew on the lines. It was little squares and as I was planning on doing iron on applique I wanted the back a unlumpy (is that a word-lol) as possible.
It worked well but did get toasty hot. I used the head that was pointed. Have not used it since!! (and obtw - have not finished the applique either :-( )