I first saw these blocks in the play area at our local grocery store and bought two sets for my 2.5 year old for Christmas. I don't think there is anything comparable on the market. The blocks are strong, large, and weigh +100 pounds each. Other similarly sized blocks are made of cardboard and are therefore not waterproof or strong enough for climbing. The only issue I have with these blocks is that there is a wide range of manufacturing tolerances. Some blocks have a tight fit while others are very loose. When stacking the difference becomes more noticeable, with a block height of 11 there can be up to a 1/4 inch difference. It may not seem like much, but it's enough to shake the entire structure. This is still a great toy and a solid investment that I have no regrets about.
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