I've been using the Rode PSA-1 for years, and it works great! I was a bit skeptical when I bought it because the price seemed quite high, but I'm happy to say it's been absolutely worth it so far.
The overall balance is excellent, and I can move the arm easily. Provided the microphone is heavy enough (in my case, I used it with an SM7B), it stays perfectly in place even when moved far away from the base. If the microphone is too light or too heavy, the boom arm won't hold! So be sure to check out other users' experiences with other microphones in conjunction with this product.
The build quality seems decent, which is to be expected at a price of €80, but could definitely be a little better.
Overall, I am very happy with the purchase and would definitely buy it again.
You have to be very careful when unpacking the arm or moving it without a microphone. Due to the considerable force with which the arms spring apart, it is very easy to pinch a finger!