The concept is good, but their design of the door is absolutely awful. The bottom and the door arent aligned and so it was almost impossible to screw it in. And as I force it in, now the nails got stuck and I cant remove it. I got 20 of my money back, but for something expensive like this I was hoping I would get my money worth. I just hope my bunny wont be able to try to take the nails out.