The lamp itself looks good (5 stars!) but i rated 3 stars due to the horrible installation instruction, a small sheet without a single word. I didn't even recognize that it is the installation instruction. It misses a few items so you must guess how to assemble them. And this is for $500 worth item (I love IKEA more and more for great instructions)! I had to redo installation 3 times to install it. Once installed you may find difficult to position shade horizontally due to design flaw. 
Note that the lamp is big so you may need another person to help you.
Having all issues above, I would accept them for $100 but not for $500.