Pros: I'm an RC hobbies fan, and I'm always alone when I pilot my helis, planes, cars or boat ! So simply impossible to make a video during flights or runs... That was THE solution... But...

Cons: The codec used for the AVI don't compress enough... So the debit used for the video is very to big for what can support the inner memory : Frame rate is much more less than the 25 fps indicated... I tried a "classic" MicroSD and it was a little better... And bought a high speed one (Classe 4) after and it was, again, a little better... But it still not like a normal video, to much frames are missed...
Other cons :
- Build quality is low : Need to be used carefully to don't brake it...
- They aren't some beautifull sunglasses : Old design...
- They aren't confortable : plastic make hurt to hears...
- When you power on, you need to press up to 7 seconds the switch, it's long ! And when you switch the camera to record, the LED isn't visible by your "peripheral vision" as they say in the manual... So you have to do that before to put them on your nose. And LED aren't visible when sun is shining !

Other Thoughts: I think the big problem of these sunglasses is the Debit used to encode the video... For exemple, 3 minutes needs around 300 Mo ! And the inner interface to memory don't follow... Change the memory for a more quick one don't resolve really the problem !

Bottomline: When I'll get 80$, maybe I'll try the other one, without MicroSD slot but maybe better : After all, I definitively need this concept... But working at the 25fps they indicate ! And don't need the slot card if the inner memory and debit are correctly thought...
And... Sorry for my poor english ! I'm french.
The best video I took with that (With the 8Go microSD high speed "classe4") :
http://www.vimeo.com/6445394
This brushless boat have a top speed around 50 km/h... You can see the result on video : It seems a lot slowly (normal at the begining : It's my 6 year children who control the boat... But not after when it goes quick !)