The down scan aka down imaging is awesome. I have a Humminbird color DI model with GPS and love it. The GPS might not be real important to you if you fish smaller waters and already know where the hot spots are and can easily get back on them again and again. I fish bigger lakes and fish a lot of brush that is in open water and the GPS really makes it nice. I can run right up on my waypoint, throw out a marker and go to fishing. The DI really helps me determine if there are any fish or bait fish near the cover though and I've truly learned that it don't lie. I'm so confident in it anymore that if I run over a brush pile and don't see anything that looks like fish I just drive away and go to the next spot. With traditional sonar I was always left guessing and had to spend some time fishing a spot for I decided that it was or wasn't holding fish.