The thing nobody mentions about metal wall art is what happens to it after dark, once a lamp is on nearby. The cut edges catch light at an angle flat prints never do, and the shadow it throws on the wall shifts a little depending on the time of day and what bulb you're using. You don't notice this in a shop with its flat overhead lighting. You notice it three months in, walking past at nine at night, when suddenly the piece looks like it's doing something the painting next to it just can't.
If you've never hung any, start with one piece in a single finish, something in a dark bronze or iron rather than polished steel or anything plated, because the dull finishes hide handling marks and the shiny ones show every fingerprint and every uneven patch of dust. In the shop, or the day it arrives, run your hand across the surface and feel for sharp burrs along the cut lines, especially on anything with a laser cut pattern, because cheaper pieces leave those edges raw and they will catch on a sleeve or a curtain eventually. Check the hanging hardware too, not just that it's there, but that it's welded or bolted on rather than glued, since glued fittings fail quietly and you only find out when the thing is on the floor. Metal art wants a wall with some breathing room around it, plain paint, plain trim, nothing busy, because the piece itself already has texture and shadow doing a lot of work, and it will fight with heavily patterned wallpaper or a wall already crowded with frames behind glass, the reflections start competing with each other and the whole thing reads as clutter rather than as anything considered. It also does not love damp rooms. A bathroom with poor ventilation will eventually dull a finish that was never meant for that kind of humidity, so keep it to rooms that breathe.
Over the years, most of these pieces age the way you'd hope, the finish softening a touch, maybe a faint change in tone where light hits it most, and that's not a flaw, that's just metal doing what metal does. Dust it with a dry cloth now and then, nothing wet, nothing abrasive, and leave the darker spots alone rather than scrubbing them bright again. A piece that's earned a little unevenness looks better for it, not worse.
Hang one well and it gives a plain wall something to hold onto, a bit of weight and shadow that a flat print just can't offer.