I just returned my second spare pair. They failed, as did the first pair. Complete loss of sound in the left earphone. Although advertised as being sweat resistant, I'm skeptical. I think the rejection was due to sweat on both occasions. The sound is average but that's because I'm using an iOS device. Apple users won't get the best sound out of them due to their use of AptX, which Apple doesn't spend licensing, likely due to their relationship with Beats. I've never had full battery life. I think on average I worked about 10 hours which is respectable although not what was promised. The fit is decent if you get it right. Depending on the headphones you use, you can get good isolation to block out ambient noise. I haven't really explored this option because I'd rather allow ambient noise for security reasons.
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