I often get asked if I eat Atkins bars and if so how often...
I occasionally eat them as a treat or when traveling or sometimes when I have to work late and my other options are not healthy.
I can't have soy and most of their bars contain soy so I avoid them except for the "Caramel Chocolate Nut Roll" flavor that only has soy in the chocolate. I still use them sparingly and not as a staple.
Now..... when I have Girl Scout Cookies sitting in my office, yeah... I'll eat the Atkins bar if I was craving something. But I'm actually not hungry so I'm fine.
I don't recommend eating the Atkins bar's if you can't eat just one. If they will trigger you to eat the whole box then leave them alone. If they stall you, then save them for maintenance. A BIG part of long term success on ANY kind of healthy eating plan is that you learn self control. For me, it's easier to stick to my bacon and eggs and not worry about other foods. If I don't have many carbs then I don't crave carb loaded foods. But once I eat something with carbs then I want EVERYTHING! A side effect of PCOS is actually that you crave carbs. So if you have PCOS, I highly recommend that you don't have "off days" very often because it's like an alcoholic trying to give up booze when you go back to low carb after being off plan.