In-ear headphone technology - best sound ever

I needed to buy new headphones, because my old apple headphones, which I got jointly with iPod Touch in April, were broken (after 9 months of usage). I decided to look for some "in-ear". I was told those ones are really good and I got a recommendation from many friends who use them. In-ear headphones are extraordinary because of their construction. They should cut out unwanted background sound, which causes that you get amazing bass response for all types of music. Finally I bought some Genius, which were quite cheap. After couple of days of using them, I can say the quality of the sound is just amazing. I can hear things which I couldn't before. And at the same time, I can't hear things in the background I could before thanks to the silicon packing :p.