The overall toy is solid in combined mode but with mine the peg where Seasaur's head connects onto Magmatron's shoulder is prone to easily popping off. Ditto where Skysaur's feet clip onto Magmatron's chest. It doesn't effect the way that the toy is combined at all, more of a cosmetic thing.

Is yours the Hasbro, Takara or Sonokong version? I'm just curious to know if there's any difference in terms of structural integrity between the versions. I have the Takara version and I've handled the Hasbro version, and I didn't notice any structural difference between those two.