Was looking to get a Whirlpool AP450 Air Purifier as it was recommended by Consumer Reports and found this place to be the cheapest on the Internet. Beat out Amazon by like $50 or so even. I was going to place the order and found it the same price as the AP510 which had another fan speed, electronic controls, and a sleep mode (was also almost $80 cheaper than Amazon). So placed the order for Whirlpool AP510 Air Purifier and it arrived a few days later, maybe about 4 days. Shipped out really quick with no issue. Been using it since. Haven’t needed to contact customer support.