These props are good because they are quiet and stock equipment. I also like the fact that they seem to break easy when an object is struck. That may sound odd but I would rather lose a prop than a finger, or lose a prop than some motor or quad part.
I've seen a guy get 4 fingers sliced open by one of these before the prop broke. He was lucky it wasn't a composite or sturdier prop or his fingers would have come off.
I trust only original yuneec props for my machines. The quality is the same prop after prop. Never trust your 1000.00 plus machines with anything other than oe.