Atlas SYR is very easy to use. Naturally they are pushing their own products so you can only see the color selection that they offer but you can get an idea of color that you might want to use if you are looking for a similar color.
Also it is important to note that this product ONLY works on an iPad.
Nice feature offered with this software is it even tells you where to stand to get the best shot of your entire roof.
Overall I would say that this is a great tool for a client to use to do their own homework on how to improve the value of their home. I don't think this is a great tool for Roofing companies or Estimators to use.
Because of the placement of the bottom of the roof to see the color it isn't very detailed. As you can see from the photos below the eves and ridges aren't defined. There is just a solid border and above that a shingle color.
So you select the bottom of the roof as a straight dotted line shown above. Then everything above it becomes a uniform picture of the shingles as shown below. You can pick from a variety of types of shingles.
Here is a video on the step by step process:
Here is the link to download on iTunes: