3M FR530CB Adjustable Steel Footrest, Nonslip Surface, 22w x14d, Charcoal/Black

It's very big and sturdy, very good quality. It will be left under our computer desk for years. It will probably last longer than we do. If you need it to adjust for height though, this is not it.

This footrest came ready to use right out of the box — no assembly needed. What stands out most is the wider footprint compared to most other footrests. Many on the market are so narrow that you constantly have to pull your legs in to sit properly, but this one allows a much more natural and comfortable sitting position. The adjustability is simple, and it stays put once set. The construction is solid steel, not flimsy plastic, so it feels like a “for life” purchase that justifies its higher price. My only complaint is the surface: it has a sandpaper-like grit that's a bit overkill. While it keeps your feet from slipping, it can be uncomfortable if you're in socks or barefoot at home. Because of that, I'd rate it 4 stars instead of 5. Still, for comfort and durability, it's one of the best footrests I've used.