Epiphany's many advantages include:
Epiphany has better video quality, most notably our camera optics are almost incomparably better. The stuff you linked to is all narrow-angle, which makes that video seem like looking through a toilet-paper tube. Whereas Epiphany's field of view is 160 degrees, almost as wide as a GoPro, so it can see everything you see including your hands: https://yougen.tv/video/9b406d41-8e68-43fc-904f-f12ce688f610...
Epiphany has much better frame design & build quality. Our material is TR-90, the highest-end optical plastic for luxury eyewear. We have spring hinges which hold snugly on your face for action cam uses. We also have an adjustable nosepiece to fit everyone's face comfortably.
Epiphany comes with awesome software called YouGen.TV that makes trimming, uploading, and sharing your videos online very straightforward (as few as 2 drag-drops + 1 click, from start to finish).
Epiphany has style - we were featured on the runway at New York Fashion Week http://bestoftheweb.quora.com/Epiphany-Eyewear-smart-glasses...
Epiphany has full support for prescription lenses with the industry-standard bevel.
Epiphany has the very high level of quality control that western consumers expect. Whereas if you've ever tried buying Chinese goods at a very low price there's a good chance that it failed QA and is "B grade" (dead pixels, blurry focus, off-kilter / askew hinges, scratches on the frame, etc).
Epiphany has better audio quality. Our microphone has an excellent signal-to-noise ratio, and we even feature a windscreen foam which filters out wind noise (windscreens are a high-end technique used in music recording studios).