The thing that never shows up in a listing photo is the sound. A good storage cart, loaded with real weight, moves with a kind of solid roll and settles with a quiet click against the wheel lock. A bad one rattles every time you breathe near it, even empty, and after a year the casters start to squeak like they're asking for help. I didn't know how much that noise would bother me until I was wheeling one past a sleeping household at ten at night, cringing with every foot of hallway.
Over time the top surface takes the most punishment, so check whether it is sealed wood, laminate, or bare metal, because that decides whether a spilled glass of water is a wipe up or a permanent ring. Casters are the other thing that gives out first. Cheap plastic ones flat spot if the cart sits in one place for months, so you get a wobble every time you push it, like a shopping cart with a grudge. Wipe the frame down, don't let anything heavy sit on an angled shelf for too long, and if the wheels are the swap out kind, buy decent replacements the day you notice the wobble instead of living with it for a year like I did.
When it's delivered, pull every shelf out and check how it's actually attached to the frame, not just how it looks sitting still. Shelves that hook into slots can lift out and crash if you load one side too heavy. Give the whole thing a shove from the side, not just a nudge, and see if the frame racks or stays square. Also check the weld points or screw joints where the legs meet the frame, that's where thin metal carts fail first, usually around month eight, right when you've finally trusted it with something breakable.
A storage cart with its honest, slightly industrial look does not sit well next to delicate, carved furniture, it ends up looking like a hospital trolley wandered into the wrong room. It also struggles on thick carpet, the wheels drag and the whole thing feels like pushing a shopping cart through sand. Where it earns its spot is next to open shelving, in a kitchen with some exposed brick or plain painted walls, or tucked by a sink where its slightly utilitarian look just makes sense instead of fighting the room.
I'd put a few canvas bins on the lower shelf to hide the stuff you don't want on display, and a plant or a stack of plain dish towels on top, something soft to take the edge off all that metal.