I agree, they are yummy! But yeah, watch out for them and don't eat too much. Another thing to check out is to make sure you read the label carefully -- there's a lot more than 1 serving per bar. According to my "White Chocolate Crisp" bar:

Serving size about 2 pieces (7g), Servings per bar Approx. 7
Total Fat: 2.3g or 16.1 for the whole bar
Total Carb: 0.34 or 2.38 for the whole bar

Granted, 2.38 grams of carbs isn't a lot, but it's something to consider. Oh, and it also says on the label, "Excessive consumption may cause a laxative effect." Oh joy