My hubby uses these in his truck. They leave a nice, subtle, non-overpowering scent that lasts for a very long time. He has been pleased with his use of them in the past, and as a passenger, I have enjoyed them too. He is a smoker, so having a vehicle that smells clean and fresh is a difficult task for him, but not with these little babies! Plus, they are much more subtle than some of the bulkier products on the market.