I was so excited to get my cat genie and hoped my cats (2) would adapt. One did right away, the other took some convincing. The old box and new were in the same location so I knew that wasn't the issue. I followed the instructions and did not clean the old box. The stubborn cat continued to use the old box to the point I couldn't take the smell anymore and had to clean it. I then tried to take the old box away cold turkey. BAD IDEA! He peed on the floor. So I brought the old box back and ordered another box of granules. I mixed the granules with the old litter in the OLD box and continued this until it was all cat genie granules. After about a week I made the move and took the old box away. He FINALLY started using the Cat Genie. I wish they would include an extra box of granules to assist in acclimation since waiting for a new box took awhile. Also, with two cats who seem to go 10 times a day the cat activation mode will not work for me since it seems like it is constantly running. The cycle time is my other complaint. 30 min is a long time when you have multiple cats using it. My stubborn cat had to go 5 min after starting it and decided to use the floor again. I have to be very careful on when I run it. Because of this I haven't been able to use the automated cycle times. I just can't figure out their schedule! Overall, the idea of this is great and the product does work (once your cats get acclimated) but the cycle time should be reduced and extra granules should be provided to help with cat acclimation.