There are 23 customer reviews on the Argos website and 83% of customers say they'd recommend this item to a friend. It has scored 4 out of 5 stars, and here's a fairly typical review to give you an idea:
"Excellent buy. Pillow and duvet very fluffy. Cover full of Thomas pictures. My son loves it!"
This set includes a duvet and pillow plus covers for both. It's washable at 40°C and is made from 52% polyester and 48% cotton which probably means it's not the softest or highest quality bedding in the world, but for £13.99 you can't really complain. In my experience, you can get away without ironing polyester / cotton mix duvet covers too. It's also suitable for tumble drying.