Part of my original 'pipe dream' plan was a metal shake roof. The cost was almost double a 30 year dimensional shingle. Over time I think they (metal roofs) are probably worth it, but I just didn't have it in the budget.
Well, now I just stumbled across a local dealer that is doing a "pilot" program. They give 'deep' discounts on the product, but you need to keep their sign in your yard for 60 days, write a testimonial, allow them to post photos of the exterior of your house online, etc. I'm waiting to hear back about whether our house would "qualify". If so, this could be a huge bonus for us.
The one question I have is about the roofing material. I thought that most metal roofs were steel - this product is aluminum. It has a lifetime warranty for original owner, transferrable 40 year warranty if you sell the house. I just haven't heard of aluminum roofs before..