Does anyone have one of these? Where the kid potty seat is build into the regular toilet seat so it can be pulled down for kids to use and clipped back up when an adult needs to use it? My youngest is a few months potty trained now but always struggles to get the potty seat we have off the clip that hangs off the back of the toilet. I was thinking one of the built in ones would be more helpful, but I want to hear reviews before I purchase!