They are very beautiful and I'm so happy I went with a sconce over a traditional lamp.  It adds so much character.  Installing them was boarderline nightmare (and this is coming from someone who has put together quite a bit of furniture, hangs / mounts tvs, etc).  There is a plate that gets mounted to the wall and another plate that mounts to the face of it... there are 3 screws that go into both plates.  Well, they don't line up and the lamps wobble ("look, don't touch").  The cord covers are cheap and I wish they would have been made to glide over eachother.  Quite a bit of bending and "making it work".  Definitely afraid of having to un-install and re-install them.