Nothing wrong with the Audio Technica ATH-CKM50ABK earbuds I have now but would like to have another pair in case they get damaged or lost. They sound great (nice clarity and bass) so I’m sold on the Audio Technica brand. I also like the ergonomic left and right design. They’re the best fitting earbuds I’ve tried so far. I just ordered the Audio Technica ATH-CKS90 from Amazon Japan. The design has been updated since last. I paid $111 for them.