Really great sound and very comfortable. The buds fit snugly using the default soft cups and block a lot of background noise out. Dynamic range is really good. They have an annoying feature though; to activate them you take them out of the box and they are supposed to pair with each other and your device but usually one of them doesn't activate and I don't know why. The one that doesn't activate has to be placed back into the case and removed again and then it activates. Battery life is several days using them about two hours a day. Another annoying feature; the lights on the case that indicate the case charge level will be still half lit when the buds don't charge, so you take the buds out thinking they would be fully charged and they die. Another annoying feature is that while the case is charging, it doesn't charge the buds. Which means that after you charge the case, you have to unplug the case and wait for the buds to charge. It should be clever enough to trickle charge the buds while it's re-charging the case so that everything is ready to go.