Bought 2 of these. Wayfair was so very helpful in changing the shipping at the last minute so I could get these on time. The cages are fairly easy to assemble. However, I had so much difficulty getting the casters on one cage that I didn't bother putting them on the second cage. The problem is the little tiny screws and nuts--they are just so small and there is limited space to work on them. It was very frustrating. Couldn't there be a better design? I would also have liked the 3 steps to be a little more sturdy. A few of my cats top out over 10 lbs and I worry each time they land on it and see it give a little, just how long they will hold up. If the casters were easier to put on and the steps were a little more sturdy, I would have given the cages 5 stars.