If you can ignore the creepy animation, it really cuts the annoyance factor of having a toddler trapped upstairs and freaking out because they want to go down. Maybe it's not realistic, but I had no problem with Jordan and Jolene tumbling down the staircase at the Smith residence on their own. I hate having to go pick them up and move them around or keep everything on one level.

I use the version that applies to kittens and puppies too, and I really like it.