I am a Bernstein newbie but there is already no doubt in my mind that he hits the bull's eye. I have lowered my carbs to the level he recommends and am already seeing improvement. I will be starting insulin soon (as opposed to blindly continuing to burn out my few remaining beta cells) and I am certain that it will result in finally achieving the control I have always wanted but never had.
I have started a blog to record my progress, so we'll see what actually happens. But I have no doubt at all about the outcome. Bernstein himself is living proof of his methods -- T1 for 65 years, approaching 80 with good health and normal blood sugar.