too good to be true? I think not! im actually doing it. I have 3 indoor only cats. One of my 3 cats has caught on very quickley and is already using both toilets because he's a bit more adaptable. but my other two are spoiled and i have to take the training a little bit slower for them. I am using flushable cat litter called "Swheat scoop" (with no clay, natural wheat cat litter) and an aluminum cooking tray in my downstairs toilet. So far i have a hole about the size of a golf ball in the middle of the tray and they actually try to scrape their waste onto the hole. The idea is to gradually make the hole bigger so that they eventualy move their feet onto the edge of the toilet seat and learn that the stuff is "magically" buried into the toilet water.
the first time i started researching this it seemed impossible, but now that im actually doing it, the thought of never having to scoop litter agian, well lets just say its getting pretty exciting.
If you wanna learn more about thsi, just google "teach cat to use toilet" and you will find a ton of websites and different ways to go about the training process.