I'm completely satisfied and use them for every concert and festival since 2007.
They are very durable and washable which allows for long use over several years.
I just recently bought another pair because I lost my original one on a festival - otherwise I would still be using the original ones from 2007 as they were still in very good condition.
Will definitely buy again (hopefully in around another 15 years - should I loose them again :D).
The best way to easily reduce too much noise in concerts!
I've basically never been able to use earplugs due my very narrow ear canals. Didn't matter if I got the smallest size, they're always either too big or just simply hurting after 10-15 min of usage... Now finally that's no longer the case! Size S fits me perfectly, no discomfort at all. I've even been able to have them on longer periods of time, finally without pain...!