Use the KH together with my elderly Samsung S2 and am thrilled difficult. Efficiency is great and the KH produce sound with proper setting tidy "thud". Yes, as some already noticed by others, the heights are not brilliant and differentiated, but for me perfectly adequate. Highend sound is probably for no ear in KH less than 100 euros, if at all. What's not quite as nice, is the "Kabelklackern" when touched. Could perhaps nervous while jogging. Durability I can not comment unfortunately. However, had my previous KH (Creative, Philips, Samsung) also "won durability price" no. My conclusion: value = outstanding.
