I had a Chaintech VNF4 Ultra motherboard and one of the USB ports on the back had broken and the board came with an old passive heatsink that should have been active (the active chipset heatsink is currently being shipped on all the new VNF4 Ultra boards).
So I e-mailed the USA branch of Chaintech (located in California) and they responded very quickly with a form I had to fill out. I filled it out, sent it back, and recieved another quick e-mail with my RMA#. WOO HOO!
The instructions from there were very clear and straight forward. I had to pay shipping costs to send it to them, but that was it, they replaced the board for free and shipped it back to me at no cost to me.
The time from when I shipped the board out to when I got the replacement back was a little longer than expected (probably almost 3 weeks), but I did, infact, get my replacement. It was a brand new board, still sealed in the anti-static bag. Even a new box! haha
The chipset cooler was active and it looked to be in perfect shape.
So if anyone is worried about the quality of customer service from Chaintech, don't be. My experience was great, and I think Chaintech is a highly under rated manufacturer! So buy that next Chaintech mobo or video card or sound card with confidence!
