JAARS installed "helicopter" airspeed indicators in our two Helios a few years back. The expanded low end is helpful for STOL operations. There seems to be a 5-10 knot error at cruise, reads lows. With GPS its not much of an issue in cruise. We still find that "seat of the pants" is the best slow speed indicator. We did swap out our VASI with IVASI, I'm I getting that right?, when we first got our planes and that is helpful.