PAPA BEAR,
Whether it would be worth it or not would be an individual judgment. This is the same way it was for the 797, 798, 598, 698 and 398 units [all of these have smaller LCDs]. Most who posted about these units said that it was worth it and that they did see a difference while a smaller number did not. There will be additional detail in the 455kHz Si sonar but with the smaller display you may not be able to see it. Now if you looked at a screen snapshot on your PC, with its larger display, the difference is definitely noticeable.