First proper flight in my usual place with the Spark in FCC mode, and the difference is unbelievable. Burned through 4 batteries, hit insane altitudes and distance without a single loss of signal, video lag, transmission issues, anything. This has completely transformed the Spark for me, was so stable and easy to fly. I used to get signal drops around 100m up and could never really go further away than around 75m. Used DJI Go 4 app version 4.2.8, with Samsung Galaxy S7 Edge and no OTG.