As for durability, it's too early to talk about problems. I'm satisfied, I compare in ears 5 times more expensive than Sony h. Ear in 2 hi-res and SBH-90C. The sound in the WI-C310 is more compressed and less detailed, there are no questions here, there is a little less bass. The sound is on a flat 4k, there are no wild jambs directly (the sound is analogous to all ears + - by 1-1.5k), the level is XBA-155/255. Sound quality is very dependent on proper fit. Choose a comfortable position for yourself, but know that the deeper in your ear, the better the sound (up to a reasonable measure). The headphones have a short channel, the speaker box is very close to the pad, at first it was strange to put them right deep into the ear. It does not cause discomfort, just unusual, I have not dealt with this before. I put 5ku, fully met my expectations. P. S. An interesting fact is that in the model for 500r, for 150k, Sony put the same pads, for me Sony pads are the most comfortable, versatile and pleasant to the ear.
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