I see this device as having two purposes. The first purpose is to surreptitiously record someone or something. Yep, they're spyglasses in a sense. Once you turn these things on it will appear to most people that you are simply wearing sunglasses. In other words, Slick, there are no lights or anything else that would alert someone to the fact that he/she is being taped, both in audio and video.
The second purpose is the ability to video (and audio) record something hands-free. For example, if you're skiing, driving a car or motorcycle, or playing sports you can wear things and not have to worry about carrying around a camera.
For the most part, the gadget works well. It's easy to use--there are only two buttons--and it's easy to plug it into the PC and fairly quickly see the Quicktime movie.
There are a few things, however, that you may want to consider before purchasing this unit. My first reaction when I pulled it out of the box was uh-oh. The sunglasses feel cheap. I've been known to drop my MP3 player about every 10th time I play it, so I don't know how long these things will last. Maybe they're sturdier than they feel, but, honestly, they don't feel like they're high quality.
There's also not a low battery indicator. That'd be nice to have.
Don't even think about using them inside unless you have an additional lighting source. These are primarily for outdoor use.
For me, the most troubling aspect about these glasses is the record button. It might just be my unit, but I had to check each and every time to make sure that when I pushed it it was actually recording. It's kind of hinky. Sometimes I'd have to push it several times. The same thing is true when I try to stop the recording. If I were to use them as spyglasses, this would sure put a cramp in my style.
Overall, they're fun. I've enjoyed them and will continue to play with them.