Summary: i spent the year 2014 with testing budget earphones and koss company never disappointed me. buying kdx100 was undoubtedly my best decision. it was kind of unplanned because my intention was to find something better than ruk30; and kdx200 as the pricier one, was looking like a better target.
Pros: Nozzle with a hard plastic, One single big sized triple flange tip.
Cons: No or very little improvement on sound quality compared to much cheaper Plug