Part of eating healthily is making sure that you get food into you every 3 or 4 hours, in a steady, nutritious manner. This helps your body feel safe about losing fat. Slim-Fast shakes are a great way to stay fed if you are too busy for a real meal.
I'm a firm believer in nutritional shakes for breakfast if you cannot get a regular breakfast in. You should NEVER skip a meal. It's bad for you for many reasons. If you interrupt your metabolism, it is going to encourage you to over-eat at the next meal. It will also have your body thinking a famine is going on - so the fat on you will be saved for the emergency. You don't want your body to be saving fat - you want it to be releasing fat quickly!
Slim-Fast shakes are only 2g net carb. The metal can they come in are sturdy and great for carrying in a car or keeping in a desk drawer for emergencies. These are FULL of nutrition. You get 20g of protein, 40% of your daily calcium, 100% vitamin C, 100% vitamin E, and much, much more. You get 4g of fiber. It really is impressive how many good things they managed to get into one shake.
My boyfriend had a stomach issue and was told to go on a liquid diet for a week to help it heal. He drank Slim-Fast shakes to make sure he was still getting his nutrition, as well as a ton of water and sugar-free sodas. He lost a pound a day doing that. It wasn't water loss - he was drinking lots of water. His body was getting ample nutrition, so it felt it was safe to burn off the fat.
Note that I'm not saying everyone should go on a liquid diet :) Be sure to talk with your doctor first before trying anything like that, just as he did.
Now I have to admit that I personally like the EAS shakes better than the Slim-Fast shakes, taste-wise. But it's sort of like choosing salad dressings - each of us has different specific likes and dislikes when it comes to flavor and texture. There are probably many of you who prefer the Slim-Fast shakes to the EAS shakes for the same personal reasons.
Lisa Shea's Library of Low Carb Books