Welcome to the FOG! (OP always good to put your country of origin in to help with urls etc.)
I have a CT36AC, and would recommend buying a D27 hose for use with other tools like the Domino, assuming you are going to be using a sander etc, other than a Planex. I prefer the 5m length, but the 3.5m is easier to handle. I also have a 5m D36 regular hose along with the Planex hose that comes with the AC version. Doing a fair amount of remodeling, the green/black D36 hose is my main hose. The short plug in adapter makes the hose really stiff at the point I want it to flex the most.https://www.festoolusa.com/accessory/204922---d2732x5m-asctrhttps://www.festoolusa.com/accessory/204921---d2732x3,5m-asctr