I ordered the white one but received the grey one.  Building it took a couple hours but it was easy.  The directions forget to tell you that you're building it upside down, so before you install the sliding door and lock/latch you'll need to flip the unit right-side up.  The unit itself is sturdy; if your dog has a habit of purposely attempting to escape their crate then they'll be able to get out of this one pretty easily.  Any dog over 50lbs, especially a power breed requiring a crate of this size, can press themselves up against the sliding door, easily pop it off the track and rip your house apart w/ in 5 minutes.