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It works well. After reading about possible 5v bec issues, Im not using the 5volt regulator at all. Using Spektrum sat. on the 3.3 volt regulator. No buzzer, no leds. Powering board with 2 cells on vbat. Using my external bec for cam and vtx. Came with betaflight preflashed which is nice. OSD is awesome! Flight is great, and no drift on prolonged hover. The only thing I was surprised by, was that the usb backfeeds through the b+ b- vbat connections, which will energize esc power, making frying something a risk if usb is used without a battery, or opening up the vbat b+ so it wont backfeed, or install a diode on vbat b+. This is really only a pain when you want to cal escs. Otherwise be aware, you can start motors on usb power if you dont do something to prevent it. Lastly, be ready to turn down your 2.5mm spacers to clear things on the top side. Very tight around usb and sat port. Im going to get another.
Great little Flight Controller! I installed it in a Eachine racer 130, to replace the original combo board that combined FC+PDB. This new FC has a faster F3 chip and the OSD is entirely configured in betaflight so it's convenient. At first it didn't work properly "as received" with BF 3.1.0 : It didn't save its settings and did other bizarre things. My best solution was to reflash it. I struggled a bit but finally with some youtube help and the Zadig tool (com port emulator in windows) I was able to flash BF 3.1.7 !!! After that, the FC was FANTASTIC. It does everything RIGHT. I highly recommend it !!! And I love the OSD !!!