A good metal bed has a little spring to it when you sit on the edge, not a wobble, a spring, the kind that comes from tube steel flexing just slightly instead of groaning. The frame should feel cool and a bit slick under your hand, the welds smooth, not sharp enough to catch a sheet corner. Flick a finger against the headboard rail and it should ring a little rather than rattle. That's the whole test, honestly, and you can do it in a showroom without anyone looking at you strangely, or at least not for long.
Measuring for one of these is less forgiving than for an upholstered frame, because there's no fabric to hide the gap if you get it wrong. Measure your mattress width and length first, not the room, and check the frame's inside rail dimensions against it, since a lot of metal beds run a half inch tight or loose and that's the difference between a mattress that sits flush and one that slides around at 2am. Then measure the room for clearance, leaving at least two feet on the sides you walk on and more if the headboard has any kind of finial or scrollwork, because those catch elbows and lamp cords in ways a flat wooden headboard never does. The common mistake is buying a frame sized for the mattress alone and forgetting that metal frames often add two or three inches of footprint beyond the mattress edge, at the footboard especially. Check the center support too, run your hand under the middle slat or support bar, and make sure it actually reaches the floor or has its own leg, because a center rail floating in midair is how mattresses sag in the middle within a year.
Where metal beds fall short is warmth and heft. They don't absorb sound the way wood does, so an older frame in a room above someone else's bedroom can become a genuine problem, and they rarely take refinishing if the paint chips, you're stuck with touch up paint forever. They also don't layer well with heavy, traditional furniture, a metal frame next to a dark wood dresser looks like two different rooms had an argument and neither one won.
What they do sit well with is plain stuff, a simple wood nightstand, a woven rug, linens in one or two colors, nothing fussy fighting the frame's thin lines. Let the bed be the only thing in the room with a personality.
Check the welds first, everything else about a metal bed follows from there.
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