It's supposed to be pretty decent, and one of your only choices for an MP40. It's got a full metal body, and all the AGM stuff I've ever seen has been really good. And yeah, get it from Airdog, they're a supporter of MAA, and you also won't have to pay for shipping, and you get much better customer service when you deal with a brick and mortar store. When you deal with someone face to face, you can usually get to check the gun out, hold it, maybe test fire it, etc before you buy it, and a brick and mortar store will usually be a lot better about helping you if your gun is a lemon.
Also, Airdog is right near you, in Newnan.