These packets came in my car when I purchased it from the dealership. Months later and the scent was just starting to fade. The trick is to turn them over when the smell starts to fade. They'll last a little longer that way. It wasn't until about eight or nine months later that gave in and purchased a bag of my own to replace them. That's a long time!!!
The scent isn't cheap like those that you typically see hanging from rear view mirrors. It's pleasant and I've always received compliments from passengers about how nice the car smells.
If you're constantly transporting passengers it'll be an even greater buy because it overpowers unpleasant smells that may accompany them without being suffocating. I've been grateful on several occasions for that!

I have a new car which I purchased 5 months ago. The leather seats were giving an awesome typical smell until recently when I noticed the smell started to fade out.
I bought these and put one under the back seat and the effect was immediate. People coming into the car again started reacting to the smell and praising it as in the first couple of months I had the car.
the smell lasts for about a month and with the quantity of pads you get in the package you have for months and months of fresh new leather car scent for a decent price.

I tried others in the past which were much less effective and the smell was less close to the real thing.
I definitely recommend these.
EDIT
I came back to add a little disappointment: the package closure isn't as hermetic as it should be and so once you open it to take out the first pad, as hard as you try to lock it back in to keep the smell in for the remaining pads, it apparently flows out a bit and eventually you really sense after a while that the rest of the pads are much less powerful in their scent.
I would strongly suggest you find a way to lock them into a hermetic box so as to keep in the leather aroma as strong as initially.
Still I would buy these again just keep them more properly next time around.
I do hope the manufacturer finds a better closure solution in the future either by individually wrapping each pad or by changing the closure mechanism of the overall package for proper reusability.

I personally love the smell of gold Dial soap... fresh, clean, but not super intrusive so having it in my car is a huge plus.

I know the pads are supposed to last about 30 days, but I'm going on close to 3 months and I still have the scent when I run the A/C or heat. Sure, it's not as strong as it was when I first got them, but they do last longer than I was expecting.

Great stuff, no oily residue, won't damage/mar any surfaces, and it sits in the vents, so it's not taking up a cup holder space. 10/10!

Works very well an helps take care of odors that are unwanted. Pretty long lasting too

Scent lasts even in the hot sun.