I purchased the HDfox watch a few months ago for the purposes of shooting a short film. This camera is not the obvious choice for shooting a film, as it has no viewfinder or manual settings. You pretty much get what you get, in terms of the image and settings. That said, once you figure out the best conditions in which to shoot, you can do a lot of amazing things. Also, because the watch is so small (and undetectable), you can get pretty creative in where and how you shoot.
The best part of this camera, in my opinion, is the unique quality of the images it produces. I'm not sure of all the technical details, but to many people, including filmmakers and film students, the images I was able to capture with this camera look almost indistinguishable from 8mm or old 16mm film stock. I've included some sample footage from my film so you can judge for yourself. Of course, these images are compressed and on you computer screen. The true test is to see these images projected. I had the opportunity to see this recently at a public screening of my film, and the images hold up!