I’ve used litter robots for many years. I’ve given litter-robots as gifts for friends and also a rescue group. I have 7 cats (all rescues). We now own 3 Open Air robots (we have a chubby boy) and love them! We wouldn’t be able to have 7 cats if it weren’t for the Litter Robots. No one can ever believe we have 7 in the house because they never smell the litter smell. The advantages and savings on cat litter pay for the unit in a year! I know the upfront cost is large for some, but believe me you will be happy you made the investment. The warranty is also great!