I am using the lowrance DI and it shows a whole world that the regular transducer misses. The 800 khz is not read as an average of the size of the cone in depth. It is read as a line or 2 D beam and has the instant update of a flasher with the ease of reading information of a graph. Kind of hard to explain with out getting long winded but I use a flasher for high speed reading, my graph for running in lower speeds than 30 mph and my 800 for trolling speeds and less. They all have a good use but it is up to the operator to learn what it is telling you.
Art