"Some of my scentportables I felt were just duds they did not scent my vehicle at all. Not with this vent clip I can actually smell them. I still think the scent could be stronger or maybe a new package/container IDK. I do like that you can twist and adjust the strength if the scent is too strong. So far I have not had that problem. If you are using the scentportables for the car you are better off using one of these vent clips in order to really enjoy the products. I do feel the size is quite large for these and think maybe a thinner rectangle shape would be better but they serve their purpose. I have also placed a clip on my small fan in my room and works nicely as well."