Just a friendly FYI -- I'm guessing that I am not the only one curious about this, so I'll share this tidbit here.
As others have undoubtedly noticed, Roche is claiming that the Accu-Check Nano is their most accurate meter to date, made to a more stringent standard than its predecessors.
As devoted Bernstein followers also know, the Accu-Check Aviva is presently the good doctor's recommended meter.
Ergo, all of that being so, I called the number in the book to ask whether they had any comment on Roche's accuracy claim. The answer was that as of right now, Dr. B's recommendation has not changed.
Reading between the lines, the impression I gathered from the conversation was that he has not yet done a formal evaluation and comparison. In any case, as of today the existing recommendation still stands.