I have a friend who has a Littermaid, and has had no problems with it, but mine broke within a couple days.  However, I did buy mine used from a yard sale, so that could be part of it.  It worked fine at first.  One of my cats likes to use the litter box right on the edge of the box, and the Littermaid doesn't clean that area very well.  My other cat digs A LOT in the litterbox.  Whenever he went, he would pile up all the litter in one big pile.  I think that's what killed the motor.  He also was used to more litter than what you're required to use for the Littermaid.  He likes to dig deep.  I have a CatGenie now, and I absolutely LOVE it.  I know it's much more expensive than the Littermaid, but it's worth it for me.  At least consider the CatGenie before buying a Littermaid.