So the ScoopFree Classic Self-Cleaning Litter Box is very helpful when it come to changing the cat litter and the crystal litter definitely does help control the odors it is very easy to use and very easy to dispose of the used litter simply remove the bottom and put the lid on it throw it away and replace with another bottom. But here is the fall back of the ScoopFree  Classsic Self cleaning litterbox,It is really big! Meaning if you have a small area for your litter box you will have to find somewhere lese to put it and the bottoms that collect the litter is not re usable and if you have to buy replacements which are pretty costly.