been there, done that. Too slow to be usable.
certainly shall be slow, my 8Gb Eye Fi is slow w/ 16mp raw files, but then I use it just to be free from cables, not to review shots... new 16Gb Eye-Fi class 10 card seems to be faster though... plus not all MF cameras as 80+mp... may be 40mp and new Eye-Fi card is ok in some cases