Product review (2 stars): It's like a cheap knockoff.
The original filter would keep the humidity at the setting and then shut off once it is reached. These filter have the humidifier running constantly 24/7 and never reaching close to the setting desired. I have seveal vintage guitars, and I need to keep the humidity between 40 - 60. I have had to buy individual guitar humidifiers since I've used these Graco's. Also, the circular shape you see there isn't close to what they come like. You'll have to fool with them a while in oder to get that shape.