The only great book that Bourbaki ever wrote? OK, the title is opinionated and contentious, but I have a definite
question. I know that the title refers to the Bourbaki volume
Groupes et Algèbres de Lie (Chapters 4-6), published in 1968, but

who said that it is the only great book that Bourbaki ever wrote?

The only reference I can find is the 2009 Prize Booklet for the AMS-MAA
Joint Meetings, where no source is given, but I'm sure I've seen the
claim somewhere else.
Edit. I have rolled back the title of this question to almost its original
form, because putting the title in quotes misled some people into thinking
I sought a source for the exact phrase "the only great book that Bourbaki
ever wrote." Rather, I wanted a source (not necessarily unique) for the idea
that Chapters 4-6 of Groupes et Algèbres de Lie  is Bourbaki's one great
book. Gerald's answer and Jim's comment together are exactly what I wanted.
 A: In a similar vein, Godement wrote in (1982, p. 6.28; translation):

... the previous lemma, which we have taken from N. Bourbaki, Lie Groups and Lie Algebras, chap. III, (the most unreadable presentation of the theory of Lie groups ever published since Sophus Lie, but fortunately the chapters on semisimple Lie groups and algebras make up for this)

Also Borel (1998):

A good example is provided by Chapters 4, 5, and 6 on reflection groups and root systems.
It started with a draft of about 70 pages on root systems. The author was almost apologetic in presenting to Bourbaki such a technical and special topic, but asserted this would be justified later by many applications. When the next draft, of some 130 pages, was submitted, one member remarked that it was all right, but really Bourbaki was spending too much time on such a minor topic, and others acquiesced. Well, the final outcome is well known: 288 pages, one of the most successful books by Bourbaki. It is a truly collective work, involving very actively about seven of us, none of whom could have written it by himself.

A: Google found this:
Notices of the AMS, September 1998, p. 979:
Bill Casselman's review of POLYHEDRA by Cromwell,
we find the phrase "the one great book by Bourbaki"  
A: I've heard this sentence (almost literally, if I remember correctly) in 1980 from Vladimir Drinfeld.
He added: his other books you buy and put on the shelf. This one you can really use.
Remark.
But other people had different opinions. Some use Topological vector spaces.
I used Functions of the real variable and Integration.
A: It might be difficult to find the appearance of "the only great book that Bourbaki ever wrote" about Chapters 4-6 of Groupes et Algèbres de Lie. But another Bourbaki book Theory of Sets has the review "Euclid in the XX century" by Guilherme (São Paulo, SP, Brasil) on
amazon.com:

Theory of Sets is the first book of
  the treatise, that counts ten books to
  this date and provides the safe
  foundation on which the whole stuff
  rests. But it can---and probably must---be
  read independently of the mysticism involving the treatise, and
  in my opinion is the best book ever
  written on the subject, showing what
  it is all about.

Of course, this might be an example of plagiarism... In any case, I see no reason to believe that reviews like this (or the unknown one from the OP) can be of real importance to mathematicians. What will be changed in your understanding of mathematics/Lie groups and algebras when you know the author of such a personal opinion?
I leave this as community wiki, since as I've mentioned above there is no reason to (l)earn something from such Q&As.
