Those detolfs are extremely popular with figure collectors especially. Really gives an all-round view of the detail.
I personally prefer the Billy Bookcase
http://www.ikea.com/us/en/catalog/products/13690607/
It's bigger and has more width so I can lay them all out straight like this.
Unless I have space to place them in the middle of the room where I can walk around it, I don't really plan to get a Detolf. The price is definitely better though and like Swift said, they come out on sale quite regularly.