The big advantage is that you tend to get more out of each panel because you are cutting back on your losses by stepping up to a higher voltage right away, you also tend to get maximum power point tracking from each panel instead of from the whole group of panels averaged out.
You also save money on wire by being able to use smaller gauge wire.
I forget who makes it, but someone out there makes a Maximum Power Point Tracker that mounts on the back of each panel, panels are then wired together for higher DC voltage and go to a single inverter to change it to AC.
Don't just buy one to "try" unless you are going to put it to use, design a system, install it and put it to use, it's proven, it will work, just do it.
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