You might also want to look into the leaf relief system, something you could install yourself or have a contractor do. It is a metal screen that attaches by simple screws in 10 foot sections onto your gutter. It does not attach to your roof at all and since it is not permanent you can remove a section if you ever have a problem. The MA vendors that sell them are Harvey Industries and ABC Supply at under $30 per 10ft.
www.leaf-relief.com