I bought the scratcher from Herb a few years ago and finally got a boat and assembled everything. I tried it out on a small lake that has never seen an ice scratcher and it was a lot of fun. Here is a link to a couple clips.
http://www.youtube.com/watch?v=rJMFl7fpDOc
http://www.youtube.com/watch?v=y8FchD-SsvE