These cymbals stands are not very high quality and I know from a friend that his stands broke quite quickly and sometimes in the middle of a rehearsal.
I felt right away after receiving the stands that they seemed fragile. So, I've always handled them very carefully, and none have yet broken for me after more than a year.
The arm can be made to stand up straight, which makes it a bit more sturdy. I would recommend to use it this way only. Or, only use it for very light cymbals. Never a heavy cymbal, like a ride.
Make sure to move the boom arm when adjusting the tightness, so that the arm really gets tightened or you might find the cymbal suddenly flipping over.