Not made for someone who prefers clarity, wholesomeness and power. It is ridiculously soft and it is very annoying to use it outdoors.
Sound quality is reasonable. However, during the call, the other parties feedback that my voice is too soft despite I speak louder and bring the microphone nearer to my mouth.
What matters most is the sound, at least for me. That's where the CX 350BT didn't disappoint. The earphones are quite comfortable and the sound quality is great as well.