I highly recommend the extra optional lesson "How Routers Learn". I taught it the day after Lesson 10. I liked the problem solving nature of it.
You can find it here or going to the overview of Unit 1 here and scrolling way down.
It took me a solid 30-45 minutes if not more to fully understand it and set up before class, so don't wing it on this one! I watched the video on my own but did not show the video which made it more confusing at the beginning to students, but I thought contributed better overall to the "oh, i get it" factor.
I would highly recommend being intentional about groups. I don't have a divisible of 8 which did have a negative impact, but I planned ahead and put a talented group of 6 together and they figured out. I also balanced out the other groups with higher and lower achieving groups mixed together. There were clear table leaders who helped others learn.
If you are giving it a shot for the first time, I'd be happy to chat or give you any of my additional thoughts.