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The difference is like day and night. Being able to tell the real intensity of the objects, rocks from bottom with major color changes.
It sort of like looking at your gas guage. Not many of us remember how much gas we have after looking at the guage. But we do remeber that we have enough. Well, I look for bright red/yellow objects and ignore the rest.
But, you've got to have a unit that you can see the color in a fair amount of sunlight, especially with a t-top. My Garmin 225 was undet the T-Top and in a small console and anytime the sun was from the port beam around the stern to the starboard beam I had difficulty seeing and at times impossible.
Most of the instrument manufacturers are now starting to address the direct sunlight problem.
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