I bought this pair of headphones at a price of 30, announced with a good discount. First test, the headphones are uncomfortable, they are "hard". The sound is not up to what I imagined thinking move from basics iphone headphones at higher-end earphones. I decide to change the silicone tips by reversing with my old headphones because they are uncomfortable. And then, surprise, they are much more responsive, insulation, and closer to the ear, the sound is completely different. It changes everything! Council, change the tips .......