I have bought and I am currently using this card.
It is based on the Silicon Image 0680 rev. 2 chipset.
It seems to work quite well, both with my hard drives(a WD and a Samsung) as well as with my LG DVD burner and Asus CD burner(all operate in UDMA without any apparent problems so far.)
However, after contacting Manhattan Computer Products at:
A representative has informed me that the bios for the chipset on this card are not flashable.(not supported)
For everyones information.