In my opinion, at this price, these stands are a hidden gem, when you consider their robustness, features and weight capacity, compared to equivalent stands costing many times more.
And they really deliver: I've had two heavy mics loaded on a stereo bar, placed about 3 meters up for a big choir; or with the boom in a horizontal position perched far over a drumkit; I also placed HEAVY (6kg) lighting fixtures (no boom) with a TVMP adapter; and in each case I was never worried about them moving (and move they did not!) But for extra peace of mind, it even includes a counterweight which you can slide along the boom.
It's always important when placing heavy loads on any stand to make sure you completely loosen the clutch, even to make minor adjustments, to avoid wearing out the washers prematurely.