Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Petmate litterlocker

I have 2 cats and 1 litter box. I have used Litterlocker for over 2 years. I think it is great. Once a week I cut off what has been used and throw away and start over again. I do not use the clumping litter. At first I did but took up to much room so I use just the regular.It is not a big deal. A couple of times I didn't realize I was at the end so so now I start feeling it out once I see the black stripe so I can tell. It's not perfect but I love it.