  I begged my husband to let me get a littermaid before we moved into our new house. I thought it would be great, I pictured never having to clean the box and the lovely fresh air of no cat box smell. That is not how it has turned out, the darn thing smells more than a regular box. It has a rake that rakes the waste into a box called the waste resepticle and the problem is that all that waste really starts to smell before it gets full. The way the thing is designed it really does not seal the box between rakings so the smell gets out. I have the mega model littermaid and it takes a week for the waste box to get full and the boxes are expensive so I do not want to change it unless it is full.
The other problem with this darn thing is it does not get all the clumps out and ends up breaking them into smaller pieces that it cant not pick up or else the clumps get totally stuck to the bottem and I have to scrape them off so the rake can pick them up. The only place I have room in a bathroom for the box is my master bathroom and the cats seem to love to use it at three in the morning.
The motor on that thing is pretty darn loud at that time of night lol. This leads to my other problem, Scarlet thinks that when I go to bed it is time to play. She is constantly jumping on the bed and attacking me and after she peed on my bed I can not sleep if she is in it even if she is not attacking because I'm paranoid she is going to pee again. I can not lock her out of my room at night because of the litterbox and if I lock her in the bathroom she keeps me up meowing and scratching at the door.
I tried making sure she used the box then locking her out but I discovered she was peeing on my magizine and newspaper pile I keep in the corner under an endtable. At this point I'm ready to throw Scarlet and the littermaid out in the garage. At least I know luna my older cat can hold it all night. My room smells, my magizines smell and I can not get any sleep ugh. 
