The Bissell air 220 air purifier arrived with a slight paint defect on the top of the machine, which was disappointing since the air purifier is quite stylish looking. Overall, it's simple to use and I like the colored indicator lights and sleep diming functions. I recently sprayed some clear cleaning liquid in the room with the air purifier and the lights immediately changed from blue to green, confirming that the air filter was indeed detecting the cleaning solution in the air. The sound of the fan is pleasant and not distracting. I subsequently bought a Bissell air320 and I like that it has a numerical readout of the air quality, which the air220 does not have, otherwise they are very similar in design and function. .