I thought it would be like a in ear silicone earbuds where it really block sounds out. Clear, full, warm, wide sound plane, no real spikes or harshness -- well done AKG! einstell option super ! I think the head for eyebrows is brilliant too! My 4 year old son loves these. The power supply met my needs and I have had zero issues with it over his first month. Some are similar to standard PC but many are not. Weve been on road trips over hundreds of miles and used it all over the Keys with two bikes loaded and never had any issues. I bought this and the Boogaloo thong sandals which is vey sexy but unfortunately the Boogaloo runs bigger than FitFlop?s size 5 that I?m familiar with. I will never train for a race.