We purchased 9 of these fixtures.  When I installed the first one, it took 5 1/2 hours, due to the poor design and the fact that there were missing parts and an insufficient ground wire.  Being a retired electrician, I was able to find substitutes for the missing/defective parts.  
The installed fixture looks okay, but I was not about to take a chance on the remaining 8 having the same problems; therefore, we returned the others.  While the Wayfair customer service representative was courteous and helpful, we were very disappointed to learn that we'd be charged $120 for return shipping, especially given the circumstances that the fixture we installed was not complete.