I actually use the second, cheaper ones with good results but not before I heat them up with a hair dryer near the center so I could bend the ring part down to the point where there was about 1.5 inches clearance between the props and the guards.
I use a plastic zip tie to secure them, that takes all of the play out.
If I had of had more time at the time I ordered these, I would have ordered the better ones but after the heating and bending mod, these do fine considering that I don't use them that much.
The better ones were a three week wait.
The only times I use them are when there are people around but not over people (with written consent), I also use them while flying in the woods.
I'll admit, it does make it easier to know where the end of the props are while flying in the woods and they make people "Feel" safer when they're on.
Otherwise, I don't use them at all.