I also ordered a Elegoo Mega board which had a nonfunctioning A0 (analog) pin, which also disabled the other 15 analog pins when a low voltage was applied to it

Also I broke a pin on a Relay, notified Elegoo and they sent 3 free replacements.

These pins are unusable for this reason.

When the voltage regulator on this board fails, it will send input voltage straight through to the USB output port as well as the pins for the breadboard rail causing unintended effects in your project (Arduino expecting 5V over USB does not appreciate a 9V input).

The kit came complete the only drawback is the jumper wires have the wrong gauge pins on them, they do not fit snug in the breadboard

When the voltage regulator on this board fails, it will send input voltage straight through to the USB output port as well as the pins for the breadboard rail causing unintended effects in your project (Arduino expecting 5V over USB does not appreciate a 9V input).