Video quality is good, Alan. I can imagine that rearward recording could b entertaining especially if u are in a group riding situation where u r recording the riding styles of following riders while cornering or overtaking or overtaking riders in front. Also, windey, undulating roads would b interesting. Best used I think mixed up with forward facing footage. Quite a lot of editing required 2 get entertaining results. Music always adds a dimension.
All these things I'm sure u know, however I find that long sequences of rear facing footage on flat roads brings on some symptoms of car-sickness.