Having already 3 DSLR bodies and an expensive collection of lenses for them, I convinced myself to not get an action cam myself.
....until I just got the chance to help myself to a GoPro Hd Hero II outdoor edition for much less then the usual retail price.
Having a huge number of cool mounting options on Thingiverse to 3d print for this helped a lot to justify the expense. After all, this caters to two of my hobbys. Filming and 3D printing/CAD.
So here it is...my fourth and (as my wallet tells me) hopefully last simultanous camera angle.