Erythritol, a sugar alcohol, is absolutely great for baking, but it does have 0.2 calories per gram. That is not a lot of calories, and not enough to switch away from.. I have to tell you and everyone I am not a great fan of counting, or fretting over a few calories, hell, life is much too short to be making lists and thinking about numbers all day and missing out on sunsets and hugs..
Screw it I'll walk up and down the stairs a few more times and have that 1/2 teaspoon of sugar in my one cup of great coffee every morning. But that is just me, I'll stay strict in my recipes for those that have a bit more discipline than I do.