We started using Feline Pine after I'd read about it on the web.  We just have one cat, but the chemical smell of all the litters we had tried was gross.  I thought we just had to live with that until I found this.  Transitioning over took some time, and without the special litterbox, it was nearly useless.  So we did have to buy the sifting litterbox from Feline Pine (couldn't find in any local stores) and we really still need to get the matching scoop. 

But it is definitely worth it as there is no specific smell to the litterbox now.  It still needs to be scooped daily (poop just is going...