They sound pretty good for the price. I walk with them in and they do a pretty good job. I can feel when they are slipping out and simply readjust them. The biggest difficulty I have with them is their pairing with each other and then connecting to my phone. To be fair, I think the connection to my phone is caused by my phone because it doesn't always pair to other music systems first try. The instructions in the box are useless and the ones online are out of date, but persist with the online instructions (Youtube) and eventually they pair up ok. Surprisingly, not as many troubles after the initial setup. I was getting to the point of returning them. I've used these for indoor phone calls and found I had to talk very loudly to get understood, so I think the mic is not so good. Outdoors... forget it. Surprised that there is a noise cancelling capability listed - I haven't found one and for that matter there should be an ambient mode. Not mentioned in my reading of the scant instructions. Battery life is very good, at least over my first week or so - hope they stay that way. Build quality seems good too. The charging case is solid and the ear buds solid too. Despite the difficulties, I look forward to using these. They are pretty good value but don't expect them to be as capable as more expensive ones.