some cautions
I've had a steel roof on my island house for 15 years now and have had several issues. I wouldn't recommend the type with exposed screws. Sliding ice can hammer those and create leaks. Get the ones with hidden brackets. Also, there will be sliding ice/snow unless you put the ice stops along the roof where you don't want large amounts of snow/ice hammering decks/structure or people below. I've had water intrusion along the cut edge where the installer didn't put the right flashing or create enough overhang.
edit: ha ha...just noticed similar issues posted while I was composing this.
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