I think they have a nice sound signature that's smooth yet detailed along with a good amount of bass and an above average soundstage. They sound better than the HF5 imo which cost around the same ($99 on Amazon for the cobalt blue).
Theres plenty of IEM's out there where some are going to have a problem here and there but the vast majority are going to be fine. Out of the 100's if not into the 1000's of the EPH-100 Yamaha has sold how many have had problems, I'm betting its a very small percentage.


















