We bought two of these but have only hung one of them so far, since they are so incredibly difficult to hang.  The screws that attach it to the ceiling are too short and we learned that the company that makes the piece that attaches to the ceiling has some proprietary ownership over the screw design (huh?) so they don't really care if they work or not.  We had to buy longer screws and FINALLY got it hung.  My husband is a very handy, so this should have been a 30 minute job, but it took over 3 hours.   Now that it's up, it looks gorgeous.  The light comes from the bottom more than we expected, but the effect is really nice.  We still haven't gathered our strength to hang the second light.  It's way more of a hassle than it should be.    

Pros: looks great
Cons: poor design for mounting