Was more complex than any jigsaw puzzle I've ever attempted.  Bought two of them.  Spent literally hours trying to piece the first one together.  Finally gave up.  The second one remains in its' carton, as a party gag.

Cons: Too many to list... but one glaring con is, whoever assembled to pieces in the factory, knew even less than I about what goes where.  Some holes were even drilled in wrong places.