The effect is very subtle, in fact barely noticeable when first putting them in but within an hour of wearing them I felt more relaxed. This was at home and for a short walk, I doubt they would make much difference in a noisy environment like an office, public transit or the pub.
I have sensitive ears and a subluxating my jaw both of which often create issues with regular ear buds and earplugs but these are no problem. The small size make them nearly imperceptable in the ear, just lucky I didn't order the minis as I was contemplating.
Shipping took a much longer time than I expected and the tracking information (or lack thereof) through the Shop app was useless. It took 15 days from order date to delivery; there was no information at all until 11 days after the order date and then none until the delivery notice. I like the product but if i decide to purchase any more, I won't be doing it through your website.