I have always had the hardest time trying to find earbuds to fit my ear. I need to have ones that go in my ear and these have been the best I have found so far. ear buds like apples or any cheap ones have never fit or stayed in my ear so in my search I found these. The are great at blocking out sound and fit and stay in my ears pretty well as long as the cord isn't tugged on too hard. They have lasted me almost a whole year and I think that is pretty good. For the most part it has worn well except the little plastic part at the bottom of each bud and I personally am not great about keeping track of the detachable in ear part of the bud so I have lost both of those. They are still usable however I don't find them comfortable without the in ear attachment and they won't stay in my ears without them. I believe you can buy replacements but I am not 100% positive. Sound Quality Perfect sound quality, keeps all outside noise out too with both buds in. Comfort as long as the in ear part is on the bud they are very comfortable. However, if you have problems with earwax then that can make them uncomfortable after a while. Design I love the design, the cord is great with the cloth on it and the shape of the in ear part of the bud shapes to your ear very well. Durability For the most part they are very durable. The exceptions being the plastic par at the bottom of each bud and the in ear attachment I find can come off easily and get lost when in bags or pockets.