(Jan. 30, 2010 Mashable.com)
Combine this with incompatibility. It's no big deal to buy some physical books from one bookstore and others from another. But to have to buy two or more multi-hundred-dollar machines just to be able to choose books from all the major publishers is unacceptable.
Amazon shares slip; Macmillan titles still missing
(Feb. 1, 2010 KTUL)