Good for small and lightweight satellites. I use two satellites with 2 8-inch neodymium speakers each (lightweight). With heavier and larger speakers, it definitely becomes unstable, especially if you adjust the distance between them too much. For what I use it for, it's super okay value for money.
At a first test with two 9 kg speakers (Ev ZX1), they are at the limit of stability. Honestly, I don't think they can support two 20 kg speakers. Maybe a solid iron stand, well welded... in the ground. The material and workmanship are fine. So, I'm waiting to see how practical they are at an event suitable for those speakers to use this extension.
