Generally speaking, I've also found that buying from Chinese vendors has been a pretty good experience.

I purchased some SBR16 supported rails and linear bearings from a Chinese vendor via eBay and am also well pleased. The total price for two 800mm rails, two 1000mm rails and eight carriages with linear bearings fitted was about £154, including postage. The parts arrived very quickly (a week quicker than some other parts ordered from MD at the same time). They were also exactly as ordered, packed well and of good quality.

I've now purchased about two dozen items from China and so far have always recieved really good service.

Jeremy