Only had the iPhone camera on me but here's a comparison between the $20 CDNN and the real deal MecGar I had purchased a while back.
CDNN $20 on the left; MecGar branded on the right:
Baseplate has a more matte finish while the MecGar is glossy.
Plastic button and follower on the CDNN $20 and the button and follower are metal on the MecGar branded one.
Left, no markings, right has "Made in Italy"
Left has no markings and dull/matte plastic baseplate. Right has "MecGar" stamped and a glossy/bright plastic baseplate.
Haven't shot the CDNN $20 mags yet, will report back though if anyone is interested. MecGar works 100% though.