That really is amazing. It's hard to think of any reliability concerns when you're covered like that.
The motor seems under stressed, holds a lot of oil and has a big oil cooler, I bet it is hammer reliable. Yes, the engines for all AJP motorcycles are made in China - specifically in fact by a company called Zongshen. Zongshen is ranked as one of the top 5 motorcycle engine manufacturers in China by size and also happens to be an ISO9001 certified company. Being ISO9001 certified means that Zongshen has, and continues to meet an outside auditors world wide standard of established criteria for high quality control management. This is one of the reasons that the AJP can offer an industry leading 2 year warranty against mfg defects on all their motorcycles (and engines) worldwide. As a side note, Zongshen has established corporate partnerships with not only AJP of course, but also Piaggio (parent company of Aprilia, Moto Guzzi, and Vespa), and also Harley Davidson as well. AJP feels very confident in these motors and has a long history with them.
AJP has been manufacturing motorcycles continuously in Portugal for over 27 years and counting. They might be new to the North American market, but they have literally 1000's of motorcycles currently in use throughout Europe, the UK, Brazil, and 10 other markets around the world.