I've always used the OED (what I call the microfilm edition- with four pages practically zapped into nonexistence to fit on each side of a leaf) and kept putting off getting a Chambers because I was afraid my house would regurgitate if I squeezed one more book into it. However, just this past Christmas a Chambers 12th appeared under the tree, and it hasn't been upchucked yet. It's veeery easy on the eyes, and it's always in use- which means I needn't have been so concerned about shelf space.