The reason we bought this bookcase is that you can get glass doors for it. The glass doors obviously prevent the boys from getting inside and eating the books or knocking over any little knick-knacks (for example: Liz's dragon collection) we want to display.
A lot of people say Ikea furniture is cheaply made. After spending nearly four hours putting together the shelf at right, I agree that it's not as solid as other furniture I've owned, but it looks nice and we honestly couldn't find another bookshelf with glass doors and cube-shaped cubbies like this. My main concern is that it lasts a few years and it doesn't collapse in the middle of the night or tip over.
You'll notice that the glass doors only cover some of the cubby holes. The bottom cubby holes can contain plastic drawers (which we bought) or can just hold heavier books that we're not worried about the boys chewing. Meanwhile, Beowulf and Arthur are exploring.