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A few years ago, I finished the attic in the house we lived in. The roof was only framed with 5" timber (old house), so I wanted to use 4" insulation, and leave a 1" air gap for circulation and to prevent mold growth. Almost on a whim, I bought a large roll of aluminum foil at Sam's Club ($20) and stapled it to the bottom of the plywood roof, shiny side out. Even before I insulated, I could tell a huge difference. I'm sure there are other products that would have performed better, but it definitely did work!
Though, I did lose out on all the free solar heat when the winter months rolled around.
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