I use it in c172a on Samsung Note 9 + Avplan Efb (there is Ios version too)..
It is another tool in the box; not 100% reliable, e.g start transmitting above 500ft and when speed is above your Vso.
I've seen aircrafts disappearing from the screen and other anomalies eg. duplicates. Light blue icons are traffic from the Internet (via ground stations) and green icons are traffic from Skyecho2 directly.
Technology helps, but it's not a bullet proof..
VFR is VFR. Full stop.
ps: Can't upload photos, need 10 posts