Cheap Feigao motor?

[Batfish]

Looking at the shipping and comparing prices elsewhere, it's cheaper, but not so much cheaper that I'd buy there. Being in the US, I'm a bit cautious about buying from a company in Honk Kong that advertises on ebay in Australian currency. I'm trying to figure out why they do that, actually.
If their "no questions asked" policy is true for exchanges, that's a nice feature, but I'd still be cautious.