I purchased an XTOOL F2 and did not realize that the controller was optional. After some research, I found out that the Controller for the F1 ULTRA is downwardly compatable with the F2. It works well and give more precise control of my machine. I can pause on the fly and resume with ease and I get at a glance data from it.
While you can start and stop the F2 from a button in the side, having the Touchscreen Controller makes the process much easier and streamlined.
I look forward to updates from further software releases to increase the functionality of the Touchscreen Controller.
Highly recommend!