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Great cards, my 2yr old is more than half way through them. I have them a 4 star because some of the cards are confusing, for example boy and eye. The eye card points to the, but my son first only recognized him as boy. He has the concept of the arrow pointing but it took a couple days for him to distinguish between the two. Leg and feet are similar to my above example. Overall they do what they were intended to do.
My son is 2 and 8 months. He's like a sponge and loves these. Only issue is most the other words toys/games he's learned from showed the alphabet in uppercase. This is in lowercase only. Yes, he needs to learn that too but having both next to each other may help all going forward.