We played it today and it was a lot of fun, with just the right amount and type of stress :D
This was my first time as a gm, and I found all the details and information/material for the players extremely useful (and sooo cool). At the same time, I felt like I could move around quite flexibly and adapt things to the group and my style. I also found it helpful in getting a better feel for the Mothership system. Thank you!