-1 star for not including a $3 spanner wrench on a $115 kit.
-2 star for missing 2x self tapping screws. (the kit obviously use to include qty 6 according to the video instructions, OB is cutting corners)
Did not arrive with functionality once assembled.
I was missing the 6mm spacer and had to fabricate my own. The primary coupler to the stepper couldn't attached to the threaded rod, so i had to swap this out. The smaller black couplers had set screws that were too large and blocked movement because they could not clear the rail.