These stands are perfect.
Even with heavy synths like my Polybrute, nothing is moving, no flex at all, all is perfectly stable, more than I expected.
Easily configurable, everything can be disassembled, so you can move pretty much every element everywhere. Need more bars in the back instead of the front? Done. Need to remove or add a bar few months later? Easy.
Cable routing is easier too along the various elements with Velcro straps.
Gives a very pro look and feel to my studio, it was not cheap but I don't regret it all all!