They just drop out all the time from the ears.Totally unusable when standing (walking, etc..)Moreover I had two times such an ear irritation caused by these earplugs, that I had to go to doctor and take drugs (ok,ok, i didn't disinfected them, that was also probably the cause). When this happend me for a second time (even after desinfection), i said, ok, i will never use them.I have to say, that when I holded them in my ears, they have TERRIFIC SOUND (better than sure e2c). What a pity, that they don't fit me.Overally: I do not recommend to purchase it without trying out them first in a studio.p.s.: i had no similiar problems with shure e2c, probably because they had a soft fit).UPDATE: i just realized that one of the speakers is not working. just after less then one years?! i didn't even use these and always kept the cable properly! definitely do not recommed these one