Thanks for all your thoughts, and apologies for getting extra adds!
As I suspected although the concept may have some merit, this product isnt really tough enough to be overly useful. Run time, waterproofing, scratch / impact resistance and the "gesture setting" add up to more gimmick than gadget!. I am sure we will see similar products in urbex videos soon, but not down caves and mines of a more testing nature
In years to come with better engineering etc who knows, but not for now.