Surprisingly durable in spite of being hollow. Least durable part is actually the stands, so be ready to make your own if you’ve got the spare pieces. Second place goes to the mounted guns, though that partially is due to me adding spare studs to them to allow them to turn, as they cannot do that on their own, though even without them being able to move they are noticeably delicate.
Other than these small complaints, it’s got a high amount of utility and the minifigures are definitely a plus. Would definitely recommend this set.