The lady behind CitiKitty got on Shark Tank and got some serious dough to mass produce her product.
While my cats are (almost completely) toilet trained, I feel the need to add a huge caveat: this takes a lot of patience, a lot more than eight weeks, and a kitten. I would never attempt this with an adult cat.
Nitro is almost ten months old right now, I've been training him since about two weeks after I got him, and he still has the occasional accident. In the process I gained a ruined bed and have developed a sixth sense for when he needs to go #2.
But the advantage of never having to deal with cat litter again (and the lingering smell associated with the litter box) is far more sanitary and sooo worth it. Except when it grosses out girls that can't imagine sitting on the same seat a cat has sat on.