These are rated to 50kg and i have made good use of that limit with a stacked setup (decoupled with isoacoustics) weighing 37kg approx.
The stands themselves seem very capable of taking this weight and I have no doubt that they could handle 50kg quite safely.
Triple leg design does give good confidence of strength.
The adjustable range is fairly generous, although I use them on their lowest setting.
Downsides:
Can’t be filled with sand and therefore regardless of weight of monitors the metal poles resonate quite badly even with the clamps fully tightened when used at the rated 80cm.
I think this is the inner tube for height adjustment contacting inside the outer tube for the actual stand… maybe it can be cut down to prevent it - but I certainly won’t do that and invalidate any warranties.
Also of note, the finish of one of the two stands was well below par - the side trim pretty badly glued on with visible excess white glue all over (on a black stand). I managed to clean most of it off but the trim is obviously misaligned on close inspection. Not a big deal though.
This along with a lack of stability (it can wobble a little), just makes it fall short of a great stand, but it is capable of holding heavy weights at A range of heights.
Unfortunately despite the range of features the stand fell a little below my expectations.