Took my cat no time at all to figure it out. It's so much better than having a litter box in plain view. And I put her food and water on top so the dogs can't get it. 

It didn't assemble perfectly. Four of the pieces of hardware were so cheap (or maybe the holes weren't drilled properly) so the top isn't it a tight fit (though you can't tell by looking.) Nevertheless I'm still very pleased.