With regard to the knock-off quality; I would briefly summarize the following points...
PROS:
Displays very well in upright position (which is the way I display all my figures to begin with);
Missile Launchers fit snugly into arms in robot mode; &
Pretty decent colour application.
CONS:
Very loose legs (which is not a problem if you join them);
Very loose left hands (they limp);
Hard to get the feet to sit flat in robot mode;
Don't bother trying to form the landing wheels on the robot's chest, way too tight;
Missile Launchers fit too tight into the jet mode wings which worries me 'cause I think the plastic is not the best quality and may eventually crack from stress; &
Silver paint can scratch off easily but can be rectified with a silver sharpie.
Otherwise a great display piece. Not great for playing or posing but considering the price and the fact that it's a KO, I don't mind. Hope that helps in your decision making!