I have and as I said, I am on some version of the diet myself, though not for weight loss purposes. In rankings
of Diets *generally* Atkins rates very low. The weight loss effects from Atkins are mostly due to the fact that carb restriction is a good way to lower calories. So it amounts to a a calorie restriction diet for people who simply want to lose weight, and it works because people generally like being allowed to eat fatty stuff, so they are more likely to stick to it than to a "healthier" calorie restriction diet.
But for people with blood sugar issues it is beneficial for other reasons. What Dr. Atkins did was to take a hypoglycemic diet that previously existed and re-package it for weight loss. At his death by congestive heart failure he weighed 258 pounds.