I have a metal roof and I sell them.
They do not solve everything.
Metal roofs require heat to melt the contact snow enough to lower to coefficient of friction. Once they do, they release all at once. That wet snow hits the ground/decks and forms cement.
The can also form ice at the peak as warm air moves up through the eave vents and begins to melt the snow covering the ridge vent, then refreezing overnight.
You get use to the details, but have to adapt for other aspects.
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