Anyone ever tried the top-loading litter boxes? Is it hard to get kitties to adapt to them? My girls get a little crazy when they bury, and litter flies everywhere. They also think litter box is for playtime and they scatter it even when they aren't in there to do their business. I have tried the covered box type and the booda dome (covered, with a curving ramp). They have helped some, but I'm still constantly sweeping up kitty litter. I thought maybe the top-loading boxes could be the answer, but I hate to drop $30+ and have it be a bust.