Automatic Litterbox Central

I have 3 cats, so it is hard to keep up with their "needs" using normal litter. I am very interested in trying out the LitterFree box, but I have not read about any positive experiences people have had with it for households with 3+ cats.

The LitterFree advertising says that it is adequate for up to 3 cats, but people are saying that it can't keep up with that many. Since there are more cats and hence more waste, I am afraid it will just sit there festering between cycles when I'm not home to run it manually. And, since they won't be able to cover it up, it will smell dirty and they might go elsewhere.

Is there anyone out there with 3+ cats who can tell me they are happy with the LitterFree?

I have 6 cats, and two boxes. My cats are happy, I'm happy, and the boxes work great. One box can easily keep up with 3 cats.