I was running my RatRig V-Minon in it's original kit content without filament sensor. Most of the time it was not necessary indeed but from time to time I was coming across problems presented by inconsistent filament diameter as stock BondTech extruder does not have spring loaded filament gears. So several times I got filament stopped yet the very "printing" was still going on. So I decided to order SFS V2.0.
Great piece of gear! Installed, modified printer.cfg file with the code from manual and everything was functioning good - both sensors right away!
For Klipper users on V-Minion printers - encoder sensor on SFS V2.0 gives sort of false triggering while priming blob is made. Increasing detection length up still to maintain reasonable sensitivity did not cure the problem and I just added a code in User_overrides section of printer.cfg to disable encoder sensor for print startup. It is possible to add this code into slicer as well but as I use several slicers, I preferred to keep control at printer, not slicer level.