The sound quality is good on these bluetooth headphones, but as sport headphones I found them seriously lacking.
I actually now own three pairs of lime green sports headphones, it must be the sporty colour. I have a cheap £12 pair - the brand of which escapes me for now. They sound fine, but rely on a tight bud-fit into your ear. On long runs i find myself constantly shoving them back in.
I also own a fantastic pair of Plantronics Fit. These rest over the ear and 'fire' the music in...better than it sounds plus you get a modicum of external noise too - not a total noise cancelling - which is essential when running outside.
These Phillips fall between the two - sound quality is good, battery is OK, and the fit is a bit more stable than the super cheapie - but nowhere near as good as the Plantronics. These will be my backup pair when I forget to charge the better ones. When out running these add another little 'issue' to my list of worries when I just want them to sit in my ears and stay there.