I really like the K553, but they could use a little more low end. From the first time I put them on, it seemed that the weak point in the sanPerfect size, color, and storage capacity. I gave 4 stars because the thong that goes in between the toes was painful. Ive had my Sennheiser HD280 headphones for ten years now. I found it better to call than to wait for the 1 email per day from the service rep. Very convenient and I dont have to split my time between music and charging! I just think they are better sounding altogether no matter what type of music Im listening to. I thought i would be fine with just one and I didn?t know what I?d do with the other but I ended up just using both and it was perfect! So, I bought 4 additional pair, in all different colors and designs. I am so happy I went with this type.