I purchased a CateGenie 60 second-hand few months back and after getting comfortable with the setup, maintenance, and routine, I've become a fan. I'd heard good things about the latest and greatest product (the CatGenie 120) but mixed reviews about service and support in certain contexts so I opted to hold off on upgrading.
A friend and I recently undertook a weekend project that yielded a modified Arduino-based cartridge that allows one to dispense any solution of their choosing in perpetuity. In my case I used a repurposed plastic bottle as a reservoir and the modification proved to be a very, very welcome enhancement. Out of respect for PetNovations, their products, and their business model, I've opted not to post the details of my project -- despite my being very pleased with the results. That said, any ambitious DIY enthusiasts comfortable with the idea of potentially voiding their warranty might find some useful resources on Instructables.com.
