Ikea lost sales with me because of the "double find" requirement that you find what you are looking for when browsing in the display area, make a note of what it is, and then you have to find it again in the warehouse. I just gave up trying to find some items.
In addition they don't put all the same things in one place in either place. They get sprawled. The idea is probably to make you buy something you didn't think of when you came in. But armed with a list, it had the opposite effect on me, especially when kmart exists :-)