It's not good, really, but it's not as bad as eating real chocolate. Just bear in mind that the bars have polyols which is the sciency name for sugar alcohols in them and they can do what normal alcohol does, which is stall you. I don't know many people who could eat 2 or 3 a day and expect not to stall but maybe someone will tell me different.
I almost never have them but have stalled every week that I've even had one. I give any 'treat' type things to my mum to ration because if they were within my control I'd probably binge on them too.
Try and eat real food, that's what the diet is about.