I love MasterCook for the organizational ability, and because I keep a LOT of recipes in it. I started a new cookbook just devoted to LC cooking; when I take an existing recipe and convert it to LC I copy it over there.

Beware however , I found that MasterCook's nutrition information is not always accurate. I've compared a lot of Nutrition Facts labels to what it says in the MC Ingredients List and found some truly glaring discrepancies! Fortunately (unlike CalorieKing), the nutrition database in MC is editable. But take care to double check before trusting it. (I posted a recipe here a while back, Parmesan Chicken Bake, and MC calculated the carbs for the entire recipe, not for each serving!)