Sturdy and easy construction. The door has an additional safety feature to ensure that it remains closed. The wires are appropriately spaced so my dog wouldn't get injured or stuck. The only reason I give a 4 star rating is that the nuts & bolts are not completely IATA compliant and I had to get separate metal nuts for the crate. For the price of the crate, it seems like a simple (and cheap) thing for PetMate to adjust by including both options (plastic and metal).