The problem is that it's a bit of a hit and miss when you buy from these developing countries. I remember when we first bought stationary engines from Japan, they came with a spare piston and rings, a set of spanners and various other parts. Some of the Chinese stuff is the same, you might get a good model but you could end up with something like the Kia Carnival when it came out. You were very lucky if you got 50,000km before throwing the engine in the bin and because of the reputation they built most of the vehicles ended up scrapped. Compare that to the early Hundai Excel, you couldn't kill them. Hopefully their aircraft engines have been thoroughly tested. The ZONSEN price has pretty much doubled since the first video clip from three years ago so I guess that's a good sign.