After many hours of fiddling and faffing, one may succeed in standing these stands up in such a way as to remain silent -- without vibration or resonances -- beneath one's speakers. After that, they'll do -- that is, they'll do, for a week or a month, until they begin to buzz and tick, again, and you'll have to re-adjust them.
They're cheap; that counts in their favour. The build-quality is not atrocious but neither is it worthy of any modicum of commendation.
Mine still stand, behind my stage piano, remaining just tolerable enough to warrant no upgrade. I have learned how to deal with their foibles but I hardly recommend them to prospective purchasers.