Sounds like a serious rush but I'm thinking chit can go wrong. I understand that the human body will accelerate to around 120 mph in the atmospheric density that exists at normal skydiver altitudes and stay at about that speed owing to air resistance. Hitting that air at Mach 1 speed could be a bit like landing in the sea after jumping off the Golden Gate bridge.
They mention that a pilot once survived ejection at Mach 2 or 3 so who knows.
Some of that stuff is pretty cool though. 60 Minutes had a good piece on guys wearing wingsuits (different than the guy in the OP but in the same ballpark) jumping from some amazing cliffs:
http://www.youtube.com/watch?v=DzYwdOufP00