This type of door accounts for about half the market.
Pros: They're relatively inexpensive and can offer the security and weather resistance of much pricier fiberglass and wood doors. Steel doors require little maintenance—unless dents are a part of your home scenario. They're energy-efficient, though adding glass panels cuts their insulating value.
Cons: Steel doors didn't resist weather as well as fiberglass and wood doors in our abuse tests and the laboratory equivalent of torrential rain, strong winds, and a decade of wear and tear. And while they're typically low-maintenance, dents are hard to fix, and scratches may rust if they aren't painted promptly.