Just got Wanda the Whale for a great price on eBay, on its way currently. I have read good reviews about it, but one thing that they mention is it doesn't work good with a wrinkled liner. Just how wrinkled are we talking here? I guess I could just watch it, and if it gets stuck move it. I have nothing better to do with my time, anyway. Still has to be better than manually vacuuming.