After 10 years of owning rabbitair bioGS purifiers, I decided it was time to upgrade to newer machines. I have a cat and a baby in cloth diapers and needed something that can deal with stink. By the litter boxes, an i45 replaced the rabbitair. The i45 is very quiet and the fan turns up quickly on auto to deal with smells. We replaced a Dyson fan & purifier in the baby's room with an i45 and noticed an immediate difference in diaper stink. The look of the i45 is much nicer, compact and modern. So far I'm very happy with this purchase and actually bought two more recently.