“Do you run in the Disney Marathon, walk at lunch or even run/walk on a treadmill? Heck, if you do any type of exercise the Denon Exercise Freak Bluetooth headset is for you!”
Mike Conrad, gottahavegadget.com 

“The best thing about these, in my opinion, is they are light, they stay in place, fit well and they are wireless and because of these things, they are something any runner would want to consider.”
Jeff Williams, Editor of Detroit Runner

“What’s cool about Denon’s Exercise Freaks is that they’re as invisible during a workout as a pair of cordless, Bluetooth 3.0 headphones with built-in rechargeable battery and hands-free call capability can be. Which is to say, until the geekerati invent an aerosol-free headphone spray for the gym, these nifty little Freaks, available in yellow, blue and black, are a sound bet.”
David Hochman, Forbes.com 

“The Exercise Freak headphones are in-ear headphones, but it’s not a tight fit—by design. The engineers know that runners need to be able to hear ambient noise (like a car horn), so while you’ll always hear your music clearly, you’ll still also be able to hear surrounding noises. What was most impressive was the play/pause button. It has a bit of an air bubble inside, so when you’re pressing down on it, the button is pushing Click on you a bit. What that means is you’re not jamming the earpiece further into your ear when you’re just trying to push the button. Brilliant design choice. They’re highly recommended, especially for regular long-distance runners who want a bit of freedom from their wires.”
Alan Danzis, Starpulse

“For the most part, earbuds are what they are; aside from a handful of solid Sony offerings, few units impressed me this year. But Denon’s Exercise Freaks are a rare exception. These Bluetooth units are built for use in the gym, and they’re about as impressive as a pair of gym earbuds can get. The Exercise Freaks are the first unit I’ve ever used that never once fell from my head, even during hanging situps and muscle-ups.”
NY Daily News, Ebenezer Samuel

“Another closed, in-ear fitness headphone–and one that can eliminate the dreaded headphone wire-yank problem–is the Denon Exercise Freak, which is a Bluetooth wireless fitness headphone. (There is a wire that ties the two earpieces together that goes behind your head.) An earhook design assures a snug fit. (Though it’s a bit tricky at first to get the fit right, you’ll get used to it in no time). For its tangle-free convenience while exercising, good enough sound for wireless exercise listening, and its Bluetooth wireless headset functionality, the Exercise Freak is a great fitness companion.”
Head-fi.org, Jude Mansilla