Thats pretty slick! How does it lock and how is the release actuated? Would it work on drop bars? I ride drop bar bike for the hand positions but my main commuter I have the bars way up to ease strain on my back.

There is a shock absorbing stem of a simular design (parrall beams) that I have seen.

As for marketing. I could see this being marketed to people with lower back issues (like myself) that cant take a tuck for extended periods of time but fighting a head wind it would allow them to drop for short distance to cheat the wind hen needed but sit back up to relax their back as needed.

I'd be interested in one if the price were right. if $50 is the market price you are in the range of a medium level stem so you are hitting a good spot.