Beautiful. Sparkling.  I’ve installed many lights in my time and this is indeed up there on the challenge scale. Being as wide as it is and flush to the ceiling, the hard part is lining up the two set screws. After half an hour and two “frustration breaks”, it lined up and was in. I always use rubber gloves on polished fixtures to eliminate any fingerprints.  Remove protective film first, install, hang crystals, install bulbs, drink beer.