I'll add to this that Dave was a great first time flyer! He flew like he had already done a half dozen skydives or logged several minutes in the tunnel. It was awesome to watch him start to feel the air and play around w/ subtle body position changes.
For others that want to see if a tunnel is close --
http://www.skyventure.com (that's the company that provides the technology). For the Multiply team - there is one in Orlando!