They definitely feel more sturdy than any gunpla I’ve handled in recent memory, but they aren’t as solid as a deluxe transformer or something of equatable size. I love the things, but the model kit assembly in and of itself, results in a feeling of fragility. The plastic is thicker than one might expect from a model kit, but the joints are often ball sockets or pegs inserted into holes which are used as hinges, and they aren’t always the sturdiest of joints. as I said, I like them a lot, but I definitely understand why people might not get the same enjoyment out of them. Especially if you want something you can absent-mindedly fidget with.