Those guys are talking about using it on a hackintosh, so they might be experiencing errors that anyone with a real Mac may not.

Some real Mac notes here (but not many): http://www.xlr8yourmac.com/feedback/Cheap_SATA_cards_inOSX_10.6.htm

And here: http://forums.macrumors.com/showthread.php?t=699955

I think I'll give it a try, thanks Mark!