Wood shingles are beautiful but not the most durable. Even though they are made of hard woods like Cedar they cannot match the lifespan of other products like Spanish tile or even normal assault tiles.
They are very eco friendly because they biodegrade completely and some historic preservation societies/neighborhoods may require them to match the time period or character of a neighborhood.
In most circumstances we advise against installing new shake tiles here in Virginia because of our high termite population, wet springs and falls and simply because we feel that there are much better options. If you still have your hear set on shake shingles or if you are required to use them because of your subdivision requirements then we of course will be happy to help you!