Extremely robust and silent after tinkering

Hooks, anchors, chain, etc. are of very stable quality. The material cross section is thicker than the usual DIY products and this alone worth the money. Installation is easy thanks to the slots and the useful metal anchors.
On a hook Amazon mat (now) silently vibrates and rotates depends. Prepared by other reviews I was prepared for a creaking noise of the carabiner in the eye of the ceiling mount. The "broadcast quality" in the concrete ceiling has surprised me but then. Sounded. On the overlying floor like on a barque in the storm

Remedy created a simple piece of cloth in the early days, that was placed around the carbine. The cloth rocked however quite fast from the hook. Therefore, this was replaced by a 10 cm long piece of transparent garden hose from the hardware store for a price of around 4 cents. Hose piece pulled over the carabiner ... and because hose bought too tight heated for 10 minutes with a hair dryer and pulled over the metal. Have used a 12mm hose, 14 mm less likely to be traded.

Now I have what I had expected when buying without any tinkering: swings and silky turn in absolute silence.

For the robust Quality at an affordable price, there are 5 points - and for reworking a point deduction, because that would have the same manufacturer also can do it yourself.