Bought these blocks as a gift for our 2 year old boy. He loves the blocks but he's not at the developmental stage yet to work with smaller blocks and balancing them. He is very interested in them, however. And the different colors are attractive. As well, it inspires conversations about colors while building structures. I have no regrets about buying these blocks and I think they're a great toy to have. I would recommend, however, the Pottery Barn blocks if you think your boy/girl might have trouble stacking and balance. I went to many toy stores before settling on both types of blocks (the PB blocks and the M&D blocks) and think these are the best of their type. Of course there are larger sets of blocks but if you're not looking for a massive collection of blocks, this is a good start.