Instruct: Classify the given review into positive or negative sentiment.
Query: Fun and durable

We bought this set of blocks mainly for our 2 1/2 year old son. He absolutely loves them! I was a little concerned when reading the reviews that people were saying you really need more of the big red ones to have the most fun. Yes, I suppose more big blocks would be fun, but the sizes of blocks that come in this set have managed to entertain my son quite happily for several hours. We may add on to the set later, but for a starter set, this is great! They are also much sturdier than I imagined they would be. My 30 lb son can line them up like a balance beam and walk across them with no problem. Overall, we are very happy with this purchase.