Barry, every you tube video I have seen had excellent results with reliability for both the 20 ga and 12 ga Emperor Arms MTP Shotguns. If I were in the market, (i.e. read - could get it by the wife) I would have no qualms on picking one up.

Difficult to beat the price point, although do not expect extreme quality out something that inexpensive. Personally, when I see a gun is a clone of another design like this is essentially an 870 clone I generally prefer to have the original. Also, if 20 gauge gets you more accurate and effective shots on target than you think you can get with 12 gauge then I see no downside to using 20ga.