I bought these head phones on March 12 of this year so I have only been using them for about 20 days. Although twenty days is not a long time to test something like headphones at four dollars these are not headphones that you plan to keep and hand down to your kids. I use them as a secondary pair for when I am going to be doing something more physical or more head phone dangerous. For example I use my nicer Bose around the house or when going around town but, this week when I went on vacation to Naples Florida I took my Wicked Little Buds because I would not want to lose them on the plane or take them to the beach. These head phones do cancel noise very well not like my Bose but much better then the stock head phones that came with my Mp3 player. On the plane you could still hear the general noise at about 40% volume but anything above that and they worked very well. While on vacation I went on an Air boat tour and they defiantly did not live up to a pair of $30 head phones I had purchased for the tour last year. If you have a chance to buy these at under fifteen dollars I would take them anything higher and you could do much better. The nylon cord does not tangle much, and if it does it is very easily untangled because it tends not to grip itself like normal rubber headphones. The tangle free feature comes at a cost though because if they rub things they make noise this is not a problem at higher volumes. Another issue is that at high volumes it tends to get fuzzy and blurry although if your device allows you to tweak levels it can be cleared up to a point. The headphones diffrent covers are great although I tend to stick to the middle size as it feels like they are the best combo of comfort and noise blocking. the small size is more comfortable but they seem lose and the sound seems far away the bigger ones feel like they are trying to escape you ears, but the quality is great.. The profile is among the smallest I have seen in ear buds. the length of the cord is perfect. In conclusion although they have shortcomings these are very very good head phones for the price; If I ever find them at that price again I'd buy 3.