I used this in conjunction with the eyelash lengthener from this company and I have to be honest, at first I didn't see a big difference like I did with the eyelash serum. However, that's the reason I always take pictures when I test, sometimes if a result is more subtle it can be easily overlooked, but when I compare the pictures from before and after I can clearly see the difference.

I didn't find this to smell overly unpleasant (though a little medicinal) even though I'm quite scent sensitive. The package also warns you could feel a tingling, but again I didn't feel anything strange or uncomfortable. It is a bit on the runny side, but I find you don't have to use much that way, just massage it in gently below the eye and you're good to go.

They recommend using this product for MINIMUM 2 weeks to see results and the pictures from me are with daily use over 2 weeks. I didn't think there was much difference at first, but when I compare the pictures the dark circles under my eyes are a lot lighter and I can see that the lines are fainter too. It isn't a HUGE difference, but there definitely is one, even only using the serum for two weeks.

Note: I used this only in conjunction with the eyelash serum and a simple micellar water cleanser so as to not influence the results.

SUMMARY
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Pros
+ Lines were noticeably fainter after 2 week daily use.
+ Dark circles were noticeably lighter after 2 week daily use.
+ No discomfort or sensitivity issues.
+ Easy to apply.
+ Smell is not overpowering or disgusting (Kind of like a light medicine smell)

Cons
- A bit on the runny side.
- Product takes 2 weeks to have an effect.

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Note: I received this product at a discounted rate in exchange for an honest review as provided here. As a consumer advocate, I believe in providing quality and honest feedback that genuinely reflects my experience with a product.