The Super*Talent Vidego28 is exactly the same as the ONDA VX858, I have used the official ONDA VX858 v00.02.0017 firmware on a Vidego28 4GB without any problems.
A member of the forums, SideWinder, has confirmed the WOLFSON WM8750 audio chip in the Vidego28. He has also used the VX858 v00.02.0017 firmware on his Vidego28 without any problem.
So, the Super*Talent Vidego28 is just a rebrand of the ONDA VX858.
_________________My primary device:
Apple iPod touch 8GB (2nd generation) with iPhone OS 3.0 software update (jailbroken with redsn0w)