The 1080x1920P resolution at 30 frames per second is more than enough to record even the finest details and built-in stabilization technology prevents the image from jarring as the camera moves. A built-in microphone records audio as well. I found the microphone to be directionally specific as it seemed to pick up the best audio of objects I was looking at and ambient noise was greatly reduced. Certainly a nice feature for those working in crowds or on a busy roadside. The range of the microphone seemed limited to close quarters or "conversational" distances.
The company claims the camera's battery life to be one hour in 1080HD mode. Not the greatest, but as long as you regularly download your footage and give the glasses a quick recharge they'll work fine from call to call. Eye of Mine also sent me an external battery pack that can be slipped into a shirt pocket and will extend the battery life to around 5 hours.
The 1080HD's come with a removable 32GB Micro SD card to record video footage, and the glasses include a USB cable to both download video to a computer (viewable with QuickTime) and recharge the battery. Since most computers, including laptops in patrol cars, have this free application there is no complicated, proprietary program to install. This makes using these glasses about as easy as using a USB thumb drive.
Operating the Eye-View's camera is quite easy; there's one large silver button on the right side that begins and ends recording and each segment is saved as a separate file with a date and time stamp, much like a voice recorder. There's also a small blue light on the inside of the frames that tells you when recording is in progress. This is nice but requires the user to take the glasses off to see the light and verify the camera is actively recording. And in a police environment, most times we would prefer not to give away the fact that we're recording. A quiet but audible tone would be better.
The video itself is excellent and since the camera moves with the wearer's head, the viewpoint is almost always ideal. This isn't the case with most clip-on or uniform-mounted cameras. I wore the Eye-View glasses on duty working nighttime patrol and they performed very well, even in low light.