...I think CrappiePappy and Alphahawk has posted some really good advice. I have an 898c HD SI unit that I bought and used on my kayak and now my boat. I think a big part of fishing is finding places to fish and that is where SI shines. I do a lot of scouting and recording. I enjoy going back and reviewing recording. You really learn how to read SI by doing so. So, I use SI to find places to fish and 2d to keep me on top of structure/brush piles. It is my understanding that you have to be MOVING for quality SI AND DI images. That is why 2d is important to me to make sure I'm staying on top of brush piles. Have not used the faux DI much. (keep in mind that HD does make true DI units.) I have since bought a dedicated 2d unit for TM and have SI transducer mounted to transom for scouting. Works real well for me...

-danny