I ordered these ear plugs and the standard size as I was unsure which would fit better. As a lady with a relatively small head I definitely found these to be more comfortable and a better fit to the standard size.
I wore them to see Iron Maiden at the O2 in London, twice, so they were throughly sound tested. I've always worn earplugs to gigs as quite frankly I want to preserve my hearing. I bought these earplugs as a replacement for basic sponge earplugs and with these I found the sound far more enhanced. The sound overall was just quieter than without earplugs,there was very clear definition, all the sound was audible, vocals and all, no underwater feeling and best of all, when I took them out after the shows, no ringing or reverberation at all.
Definitely a step up from spongey ones, even when I was singing along they didn't move or budge or leak sound in. They do stick out from the ears a little bit so maybe not the best if you're in the moshpit but as I'm ususally in the seats, (I'm short too and I like to see), it's not a problem.