Had 2 ceiling fans installed. When turned on at full speed one had a terrible wobble and appeared unsafe.  A second technician came within 3 days.  He uncovered a few install flaws from the first install. Ultimately he wasn’t able to stop the wobbling fan and thought it might be a faulty fan.  Will try to exchange it at Wayfair.  I believe the install was around $250.  Not sure if I will have to pay for the 3rd trip or will have to try to install myself.