Last year I picked up a 73dv on eBay for really cheap. I used it with the transom mount transducer mounted to the end of a PVC pipe. It actually worked pretty good. But I don't think the target separation was very good. Fishing side-by-side with my showdown I noticed that when the Garmin shows that I am on the bottom the showdown I was about 6 inches up. So, I bought the GT-8-IF ice transducer for this year hoping to get better target separation. But with no ice I'm not able to give it try. I'd love to get the panoptix but that's not in my budget now.