You are right, this is an expensive solution, but IMO so elegant, and for me at least, in a perfect position on the bike, better than the other solution out there that mount the device to the stem itself. The device sits a few more inches forward, reducing the amount of head tilt down required to look at the screen, and positioning it better ergonomically.

That solution already exists at www.f3cycling.com and started out as a Kickstarter project, which is where I got the idea from. It is very expensive though, $60 for the base mount, $15 for the gopro adapter, $40 for the phone adapter (ouch!). I personally would be willing to purchase the base, if someone on here were to come up with various adapters for our devices, adapters we can 3D print.

Would that be cheaper overall? If there was enough interest on the board, we can potentially do a group buy. What do you think?