For us they work great until they die. A+ for price, speed of Prime shipping, ease of installing & usefulness. Do I recommend it?Absolutely! I realized that when tapping a specific part of the left side I could turn on the sound though it cuts out every once and a while First pair and postive experience so far. Im someone whos always leery about purchasing electronics that arent name brand, especially ear buds. Everything about it screams knock off. This type of 511s are I e of the older styles there is no stretch in the fabric but has Teflon in it. If you are looking for a case that will last for very long time and with simple and cool design. My husband gifted me my ear buds for Christmas.