The bars have an interesting price, quality to match the price.
They make a lot of noise when moving and the rubbers that hold the longitudinal bars don't seem very durable, but I'll only be able to confirm with time. At 50kg they start to become a little flexible, but there are no signs of it being serious.
Installation is easy on Nissan Qashqai J11.
In short, for the price and for specific uses they are fine.