I have been testing these this summer with good luck, no falling off cord and scent staying good for 30 plus days. I gave 3 different ones to a family member and they told me the scent didn't last past a week, and one fell off the cord ( all in different cars) they thought will the cord one, the hole was too close to the edge. For those that have these, how long are you smelling them? In my cars I can still smell one in there since June 1st, not as strong, but can still smell it. I have made them both bumpy and smooth (by accident). I have thought about once the FO is absorbed to try and add for FO to see how much they can handle to get a stronger lasting scent. I love the look of them, but will the beads just in a bag last longer? The heating up process, I think, maybe taking the majority of the FO out. thanks for any feedback