We've got a walk-in wardrobe in the master bedroom of our new place, and the existing fittings were pretty crappy, so as part of the repaint, I ripped out the old stuff, and we bought some new elfa stuff from The Container Store.
We did the initial design a couple of weekends ago, and went back today to actually buy the stuff.
The whole process is pretty slick. You rock up with your measurements of the space, and a designer fiddles around with some special CAD software and does up a design for you, and that spits out a pick list of all of the bits you need, as well as what needs to be cut to custom lengths. A couple of hours later, you come back, and they wheel out a cart load of bits and pieces, you put it in your car and head home to put it all together.
I was initially a bit worried about the assembly, but it's even easier than IKEA. You get tailored instructions for your design, and the only point at which it anchors to the wall is at the top, and then everything hangs from there, so it's pretty hard to screw it up, and it's all adjustable. Added bonus: in an earthquake, it moves with the tremors instead of toppling over or ripping itself out of the wall.
I'm very impressed by the product, and absolutely love the result. It only took us a couple of hours tonight to slap everything together.