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These are small leaflet type books, so be aware of that, but to be honest that's perfect for my 5.5 year old. He is in year one, and I'd say his reading ability is fairly average for his age - he's probably near the top of his class but nothing out of the ordinary, and he can mostly read these to himself, with the odd bit of help here and there. So they are the perfect level for him and short enough that he can finish them in one sitting.
Great books for teaching kids to read! My 3 year old just got them and is already reading them by himself. Lost a star because it's kind of annoying they refer to the kraang, and footclan and shredder as robots and the mutegan as goo, but it's great for teaching them to read