The book was excellent. For one thing, Tufte practices as he preaches. The graphics and the text flow together beautifully. His points are all very well illustrated. There is lots of white space which makes it much easier to read everything. The examples are all clear, and pretty, and often entertaining (my favorite was the graph that was so cluttered, that when it was reproduced in another publication they managed to leave out the data without noticing).
I'd highly recommend this for anyone who ever has to put together a presentation. Even just as a book to read, it is quite entertaining. The horrible things people have to do and with graphs are just hilarious.