In terms of materials feels like an improvement comparing to the standard Millenium regular stands. They're quite robust, although the rubber on top could be more stable, it comes off pretty easily.
Unfortunately they have a huge flaw, it's not possible to move the platform in the horizontal axis which seems pretty basic. Every monitor pair should be twisted in a certain angle according to the listener's position to achieve a sweet spot.
The platforms can be moved in height, tilted up and down, but not turned/twisted to the sides. The only option is to turn/slide the monitors onto the platform which I find it unsafe.