My son likes to wear them. They are so comfortable and don't slip. He's 3 years old and wears a size 9 so I didn't know what size to take. I went for the larger ones so they would last a long time and be perfect for him!
Pros
Ideal for toddlers who don't like normal slippers. They are very warm and cosy.
Cons
May be too bulky to wear with some types of shoes.