First of all, I am quite surprised that Letterman is actually having such a week, as it is my understanding that he doesn't really care for magic.
Ok, I will first preface by saying I am a mere hobbyist so who am I to say...I caught the 1st night with Jason Randall, and boy was he nervous. Granted, Letterman is not your ideal magic audience, but being the 1st guy on so called, "Close up Magic Week" was not a good choice. To my surprise, he has been on 5 other times and he was still that nervous. I'm sure Mr. Randall is a fine walk around/corporate magician, but he did not come across well in my opinion. I am hopeful the others (Carney, J. Ace, S. Cohen and Ammar)can handle "Letterman, the spectator"...its certainly not like showing Johnny Carson a trick.