Roof and corner trim option

I was walking through HD in my never ending cycle of lumber runs when I saw something that caught my eye. In the flooring department I noticed some stair tread edge guards. The are mass out of aluminum and come in different colors and textures. For a twelve foot piece the cost was about $12. I am wondering if anyone else has used this and do you think it would work? I am building a weekender so there are no curves.
