The guy that invented them (Wayne Hockmeyer) actually wrote a book on them (I have it).
He knows a lot more about fishing techniques than some folks give him credit for

He was a guide in Maine for many years

http://books.google.com/books?id=3r1SGC5WvnwC&pg=PA106&lpg=PA106&dq=%22Wayne+Hockmeyer%22+%2B+fishing&source=bl&ots=j2UPZAyvq9&sig=-wT22wQosnnhvb3rZB95KB2Tleo&hl=en&ei=RTseTv_nGs6EsALmz6m7Aw&sa=X&oi=book_result&ct=result&resnum=10&ved=0CFEQ6AEwCTgK#v=onepage&q=%22Wayne%20Hockmeyer%22%20%2B%20fishing&f=false
http://www.northernoutdoors.com/site/adventures/fishing.html
The website has a "Tips and Techniques" section...check it out and compare to how you guys fished them

http://banjominnowstore.com/
For anyone that wonders about the similarity between these and the Renosky Bionic Minnow & Boomerang...
http://www.renoskylures.com/bionicminnow/
http://www.renoskylures.com/boomerang/
It should be noted that Joe Renosky was the former CEO of Banjo...
http://me.findacase.com/research/wfrmDocViewer.aspx/xq/fac.20010820_0000238.DME.htm/qx