I am trying to play devils advocate
here! You bring up a good reason to do the upgrade. Personally, I would try the existing software out on the water first. Then do the update and see if it makes that much of a difference. You can always go back.
Before you try to go out and fish, I do recommend that you spend time out on the water just scanning, making recordings, and working with the settings, etc. By making recordings you can come home and play them back on the unit, adjust settings, make some snapshots, etc.
Robert