Has anyone tried one of these?

http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0032007017541a&type=product&cm_mmc=CRR-_-RLP-_-017541-_-image_link&cmCat=CRR&cmCat=netcon&cm_ven=netcon&cm_cat=Google&cm_pla=Durasafe%20lock%20for%20Lowrance&cm_ite=netcon

I'm pretty sure I could tug the whole unit off if it were ram mounted... I think it's pretty worthless to a real criminal who wants your graph.