He's an audiophile AND fitness head, so I trust his opinion highly.
I've owned previous Plantronics gear and been very pleased with the sound quality. Personally I don't like that particular style of sport headphones because they don't work well with bicycle helmets. My wife liked them because they work well with her natural hair style.....that stiff band on the back sits off of the neck. Also she likes that it doesn't pick up noise vibrations from rubbing like the other styles do. Looks like those plantronics are designed to be water/sweat resistant too..which is a bonus

"Get ready..for your blessing..."