I already did, but this Playbill feature makes me really want to see it:

“I compare it to a musical in terms of the energy it takes,” said Greg Germann, who replaced Whitford in September. “It’s a freight train — or I should say a high-speed train going at full tilt. You just got to get on board and hold on.”

Missi Pyle joined the cast the same time as Germann, following Mary McCormack into the role of the domineering German stewardess Gretchen. “It’s by far the most taxing thing I’ve ever done,” she said. “I met Mary before taking the part. The cast was all bruised and battered. I said ‘What’s going on?'”