S!
Adds another wire I guess and it's construction is not the sturdiest one. I already had to use "super glue" to make the led "lever" stick etc. The wires I bundled with the headphone wires to a neat cable, so no real problem there. Wireless is not an option for me, in copper I trust!
Otherwise TrackClip Pro is a good thing, less interference with backlight as you can adjust the light filter so that only the tracking IR goes thru etc. After setting up TIR it is a breeze to use and sure helps. Feel handicapped without it and have noted I have tried to turn my head while watching videos..LOL!