I have a fitbit one, I love it
I do use it for the food sometimes, but I'm on a food delivery meal plan, so right now I don't need to bother since I know the calories are always going to be around 1300-1500. As long as I see in the fitbit dashboard that I've burned my usual calories, I'm good.
When I do enter calories, it can be motivating to see the little dashboard showing if I'm in the red green or yellow zone.
You can add people as friends and compete against them in steps which I like. Right now I need to get some walking in today, they're beating me soundly.