Another great video, Peter. Thanks for sharing!
As for thoughts on the diameter on the hoses. I think Festool ships with the 27mm as its the only one to fit all their tools (to my knowledge). The 36mm wont fit Rotex/dominoes. It would be pretty sad if you had only a Rotex, ordered a dust extractor, but had to get another hose for it. If I were to purchase again, I would have gotten the more expensive cleaning kit with the 36mm hose from the start.
I just started using 36mm hose, and the difference is massive (78% more area). Much easier to clean the shop for chips and other things without worrying about them getting stuck.