I went so far as to look at the website, and contemplate the value proposition...Who in their right mind is going to want this?
I take very few photos with my iPhone, but I did waste a few seconds distracting myself pondering if such a device would lead me to take more photos... who knows, maybe it even comes with some magic built-in so that all photos are 'photographer of the year' contenders... but this lasted but a few seconds, since I know a handle won't lead me to want to take more photos, and yet another subscription is just not going to happen at this point.
I have no idea what the eronomics are of this thing, but if it improved on what I see as horrible ergonomics of iphone photography, I would bite, maybe, for a reasonable price (but only desiring a better grip = a price <10% of what they are asking)