Yes on the DI. I have found it very useful in IDing the type of structure I am looking at. I did end up going with the Hummingbird vs the Lowrance (sorry Chatt) because I like their sonar better and I felt their imaging was comparable. I can tell what type of fish I am looking at and the DI tells me the exact type of cover I am fishing and many times I can tell if the fish is in a active or negative mood. Like I said I have fished places for a while but did not know there was a twig sticking out of a rock that had 20 fish on it. I just knew there where fish there on the break. Now I can mark my spot exactly and fish it more efficently. I am a firm believer that you can find a hot spot but there is alway a spot with in the spot that produces more. I have an HDS 7 on the front of my boat and an HB HD 597 di on the back. With those two tools my fishing has improved. We fished Truman a few weeks ago our tools allowed up to find fish quicker, eliminate dead water and fish new areas no one else was and fill the boat with big fish.