Does anyone uses...?

Does anyone use the "Calorie Counter" app from MyfitnessPal? If so, How is it? Is it any good? Does the app sync with your food log on MyFitnessPal and your profile? I've noticed that the app has a "Offers in-app purchase" and "In-app Products", what does that mean? Do I have to buy something in the "Calorie Counter" app to use it, but in Google Play, it says that the app is "Free"? Is there anything else I need to know about the MyFitnessPal "Calorie Counter" app?

Thank you in advance.

I use it as a lot of us here do.   It is a very good app and syncs with my computer too, so I can enter my stuff on either one.   It has a scanning feature on the app that makes entering items super easy.  No, you don't have to buy anything to use it.

Cool.  I hope it is a good app. That's one thing I've heard about the app that it has a scanning feature, How well/good is the scanning feature on the app? Cool, but what is "MyfitnessPal Premium?