These are the lightest weight and fastest to use riser legs I have ever put my hands on. Our use is with small, 3'x3' platforms for camera and operator, so they must also be rock solid and on a smooth level surface, and they are (even at the tallest, 32" height). These likely would not hold up on a national rock tour, but if not abused should have a long life.
Caveats: all nine legs must touch the floor, which means the floor must be perfectly flat. Spacers are available as an accessory, but we've found that shims end up working better for small gaps since gaps are mostly odd sized. Residential style carpet with padding, not surprisingly) will also create some 'give' with a single, small platform, though combining with other sections would minimize that. If metal 'spike' feet (that come with some tripods) were an accessory, we'd buy them.
Finally, since we constantly transport the platforms, a Velcro cable tie wrapped around the middle helped to keep the legs together, though we've since moved on to using a nylon gear bag (Ruggard has one that's a good fit) which we like even better. The side pocket holds shims and the hex key for locking the platform.