For years I thought metal cabinets belonged in a garage next to a shop vac, not in a house I was trying to make feel like a home. Then I needed something for a mudroom that could take wet boots, dog leashes and whatever my husband tracks in from the yard, and wood just wasn't going to survive that.
What changed my mind is how a good metal unit actually ages. The ones worth having develop a sort of softened look over time, small scuffs that blend into the finish instead of sitting on top of it like a scar. Spills wipe off in seconds, which matters a lot more than I expected once we had a coffee mishap on top of ours during the first month. A damp cloth and occasionally a dry one after is really the whole care routine. Where they struggle is rust, so if yours lives somewhere damp, check the bottom edges once in a while and keep it just slightly off a wet floor if you can. After a year of daily use ours still closes the same way it did on day one, no sagging, no sticking, which is more than I can say for a flat pack wood dresser we had in our old apartment that started drooping within months.
The day it arrives, open every door and drawer before the delivery person leaves, because this is when you catch the problems. Run your hand along the edges for sharpness, check that the doors sit flush and don't rattle, and look at the welds where panels meet. On a well made unit those welds are smooth and even, almost invisible under the paint. On a disappointing one you can feel ridges, and the whole thing flexes slightly when you push on a side panel, which tells you the metal gauge is too thin to hold its shape for long. Hinges should feel solid when you open a door, not light and tinny. Check the base too, since a unit that wobbles on four separate feet instead of a solid frame will eventually walk itself crooked on a floor that isn't perfectly level, which describes basically every floor in our house.
The small thing that makes the good ones a pleasure to live with is the sound they don't make. A door that clicks shut quietly instead of clanging, every single time, for years.