I put a metal roof on my house nearly 20 years ago and never regretted it. The panels are actually polyester powder coated, not painted. I used 2X4 pressure treated sleepers over the asphalt shingles and shimmed them to account for settling.
My roof is a light gray. My neighbor installed red panels about a year after I did mine. There is some fading on both colors but not a speck of rust anywhere. My neighbor changed the screws on his roof two years ago and I will be doing the same this spring. The rubber washers are cracking and the screw heads show some rust where the drill driver chipped the coating. It is a one day job and costs less than $100.
The biggest surprise I got was how much cooler it made the attic in the summer - at least 20F at mid-day. I was also preasantly surprised how the sound of rain on the roof puts me to sleep at night.
I cannot imagine ever having asphalt shingles again.
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