SCHOOCH,
I have the Lowrance HDS-8 unit (Gen 1) and went ahead and bought the structure scan at the same time. The structure scan allows you to see items in the water column differently than the sonar. It does provide more of a 3D view and allows you to view items in clearer definition than a sonar unit. However, I find that I do not go to the structure scan view often, and hindsight being 20:20, I would NOT have spent the extra money.
If you are looking for structure such as trees, old sunken boats, etc, then I can see it being worth while. However, I am typically a walleye/laker/trout fisherman, and 99% of the time use the sonar and GPS mapping. I use structure scan more as a novelty than a tool.
My two cents for you..........
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