Couple of days back I also got to see that program.
I didn't feel it as much promising since (if my memory is true) even the area where the wiper does reach was also has water repelling tendency. So seems like they must have used some water repelling product all over the windshield or the glass must be new. In either of the case, any new wiper should do an amazing job. OT:
Have a look into my windshield
Did you know about proklear rain repellent product? Have a look into my product review thread of this product. Proklear Nano Anti-Glare & Rain Shield Treatment for Windshield