The result of the additional busbars is that the solar panels are about 2% more efficient. This means that they can output 2% more power in the same size solar panel. As their manufacturing process gets more and more efficient, they can increase the wattage of their standard 60 cell solar panels.
Hard to see the difference -Unless they are side by side
The change to the design does not change the colour of the solar cells or the size of the solar panels. However, when mounted side by side, the additional busbars may be noticeable. If you are adding additional solar panels to an existing array that is in a visible location, you may want to match the models to keep the thin lines consistent.
If you are ordering online, be sure to note if you need the older 3 busbar panels, they are available by request while supplies last. If you are installing a new system or adding onto an existing solar system that is not in a high visibility location, using the new 6 busbar models will get you a higher efficiency solution.