Its time for this old fisherman to upgrade to a current model of fish finder. Soooo many choices! I usually just use my finder for depth and a little for structure, but not much as I usually know the lake I'm fishing fairly well. That said, it'd be nice to have one'a them new fangled fancy schmancy thingamajiggers. I'm not looking to spend $700, but I don't want some cheap POS for $100 either. I'm hearing good stuff about the Hummingbird Helix, but does the DSI really work? Is it pretty accurate and is it even necessary? So give me your thoughts, what do you run on your boat? If you've used DSI, is it worth it or is it pretty much new technology that isn't quite there yet? Thanks in advance for your input!