Not tested. looks OK
A reasonable product, but no interface to re-program the pic. Very thin board with even thinner copper. Be very careful when soldering. Wiring pads make soldering difficult even if you have a good soldering iron and skills because they are almost microscopic and the solder does not want to flow onto such a hairline pad. Idle position starts at 35% throttle and full speed at 70% transmitter stick. Pads should be bigger and thicker because 20A wires are thicker. Finally, it is a good attempt at design that is still practical as a lightweight controller. It is very compact. Tip: The photograph on the Aliexpress page lacks the polarity details; but the connection photograph that shows a motor, pcb, battery and servo lead should be marked clockwise as follows from the top LH side -M +M +B -B -rx +rx pwmrx. See photographs below.