Hopefully some useful information for people nervous about this app.
Thought I'd brave the cold here in Blighty (UK)! Weather conditions were not great, fairly windy, very overcast and 'spitting' on at rain, 2°C.
Tested the LTE version with my Sparkie and my Galaxy S7 (Rooted 7.1 android).
Worked without any flaws,
Maps working,
Auto home point working Precision landing working
All mavic flight modes working (Not ideal location for terrain mapping but went over a small collection of weeds)
Normal quickshot modes all working
Return to home and auto land working
OTG and WIFI working
Sport mode working
Didn't test for distance due to weather and safety reasons.
I did get a audible message saying ATTI mode when I was about 500ft away, No problem manually flying it back towards me but a little wind drift at first (already know how to fly without GPS).
I didn't look at screen whilst manually flying back to me, but when it got close enough I noticed the LEDs were green and the screen showed it had GPS signal again. I think this was more to do with the weather than the app to be honest.
Hope that helps some of you out, best advice is don't be too worried about apps, just be sensible when flying and always alert. As it's probs been said to death in the forum, get used to flying without all the GPS aids etc, then if there is an issue, you know how to get back without freaking out.
A little question for the OP ref the MOD app, Am I right in thinking it's an overlay that can run over the official GO4 app and allow FCC and mavic modes?
Thanks