Here are a few images that I stole from our slate installation guide, so you can get an idea of what it looks like:
So here's an example of what this ends up looking like on your DaVinci eco friendly roof:
Here's the staggered version of the coursing (from the installation guide again):
And then here's what it actually looks like on a roof:
I have to admit that I am partial to the staggered look - it just looks more elegant in my opinion; however, with that said, there are certain styles of homes and buildings that simply don't look right with a staggered coursing. The particular one that comes to mind is a Georgian style home and that's because traditionally they have always had roofs that are laid in a straight coursing.
If you are a roofer and would like to get a more detailed explanation of how straight and staggered coursings work with our lightweight tiles, then you can check out all of our technical downloads - the installation guides in particular will cover the different coursing options.