I normally don't eat Lean Cuisines or Smart Ones, etc. every day-but I use them on occasion when I have terrible cravings for something like pizza, and I want to satisfy that craving with built in calorie and portion control.
My favorite is the Lean Cuisine Egg Roll/Vegetable Rice one-I use it for my chinese buffet cravings.
I also love the Lean Cuisine Roasted Vegetable Pizza. I have it with DH orders Papa Johns or something and I want to stay out of it.
As far as breakfast-just stay in about a 300 calorie range, and make sure that you are eating 1200 calories a day total at least. If you are eating LC's for lunch and dinner, then I would recommend having other things for breakfast:
-a banana with a tablespoon of peanut butter smeared on it with cup of nonfat yogurt on the side
-a slice of whole grain toast with a tablespoon of peanut butter, and a cup of berries or grapes
-a small portion of healthy cereal and skim milk, fruit on the side if you have the calories left for it (depends on calories in the particular cereal-I like bran flakes, Kashi, raisin bran, etc.)
Just a few ideas...