While it was easy to put together, part of it you have to drill down from the top to secure and have visible screws. Nothing is pre-drilled, and the directions say all you need is a screwdriver. It is very small, and a standard litter box does not fit, and I had to search high and low for a Rubbermaid box that would fit. My cat used it just fine, but for all the hassle, I don't think it was worth it. It was always hard to get the litter box out to scoop, and there was always a huge mess to vacuum out. I ended up throwing it away and buying a top hole litter box. I would not buy it again.