We have owned a CatGenie since 2009 starting with the old Cat Genie 60. We had very few complaints with that unit, I guess the only thing I didn't like about the old 60 is the monthly maintenance it required to keep it clean and clog-free ( you had to completely disassemble unit and hand wash. It was still an upgrade from scooping 3 times a day, in my opinion). Well, when they came out with the CatGenie 120 that not only washed the litter, IT NOW SELF CLEANED, AS WELL? I HAD TO HAVE IT!!!!! . I upgraded, and couldn't be happier. Now not only do I never have to scoop again, I now don't have to wash the CatGenie either. An excellent improvement on an already awesome product!