I’ve been purchasing Air Wick Apple Cinnamon scented oil refills for 2.5 years now. It’s my favorite scent for year round. I usually change the refills about once a month. The price is just right. I Ike that they’re glass and not plastic, I can take the plastic ends off and put the glass in the recycling once it’s empty. The smell is not over powering, but leaves my home smelling great despite having 4 pets.