I don't have a pug personally however I have several close friends who have them - and most have several of them. They simply love them. They are good with children if the children are taught to respect the dog and not abuse it. I would always advise supervising kids and pets however especially with the little ones.
Here a great page I found with more info just about the pug itself if you'd like to read more about them:
The Pug - Purebred Dogs and Puppies
I hope this helps
D