Pros: They're light weight, and kept a strong signal.
Cons: These headphones only lasted a couple of weeks before they started to wig out. I only used them for light exercise and took them off prior to getting very sweaty. The sound quality is tinny at best and fell short of my s9-hd's that I was replacing after my s9-hd's quit (after two years of use). They were quite a disappointment.
Conclusion: I love the idea of bluetooth headphones to work out with but unfortunately, these simply do not stay on your head. Even before I get sweaty they want to fall forward, and when I do get sweaty its a perpetual battle. I was overall very disappointed with the fit of these headphones. Style wise, they are not my thing, but far from awful. The earphones are much smaller than you would think from the pictures but in general they seem well made.
Summary: I think they sounded great, but they ear piece that it supposed to turn, broke on first day's use. I wasn't doing anything that taxing to cause it either. All I did was twist one ear piece to the horizontal position. Let's see how the return/warranty policy works. I contacted the mfg and they replied right away.